Initial snapshot - OpenTelemetry demo 2.1.3 -f

11 files changed, 5509 insertions, 0 deletions

diff --git a/src/checkout/Dockerfile b/src/checkout/Dockerfile
new file mode 100644
index 0000000..9aa66af
--- /dev/null
+++ b/src/checkout/Dockerfile
@@ -0,0 +1,28 @@
+# Copyright The OpenTelemetry Authors
+# SPDX-License-Identifier: Apache-2.0
+
+
+FROM golang:1.24-bookworm AS builder
+
+WORKDIR /usr/src/app/
+
+COPY ./src/checkout/go.mod go.mod
+COPY ./src/checkout/go.sum go.sum
+
+RUN go mod download
+
+COPY ./src/checkout/genproto/oteldemo/ genproto/oteldemo/
+COPY ./src/checkout/kafka/ kafka/
+COPY ./src/checkout/money/ money/
+COPY ./src/checkout/main.go main.go
+
+RUN CGO_ENABLED=0 GOOS=linux go build -ldflags "-s -w" -o checkout main.go
+
+FROM gcr.io/distroless/static-debian12:nonroot
+
+WORKDIR /usr/src/app/
+
+COPY --from=builder /usr/src/app/checkout/ ./
+
+EXPOSE ${CHECKOUT_PORT}
+ENTRYPOINT [ "./checkout" ]
diff --git a/src/checkout/README.md b/src/checkout/README.md
new file mode 100644
index 0000000..28064bd
--- /dev/null
+++ b/src/checkout/README.md
@@ -0,0 +1,36 @@
+# Checkout Service
+
+This service provides checkout services for the application.
+
+## Local Build
+
+To build the service binary, run:
+
+```sh
+go build -o /go/bin/checkout/
+```
+
+## Docker Build
+
+From the root directory, run:
+
+```sh
+docker compose build checkout
+```
+
+## Regenerate protos
+
+To build the protos, run from the root directory:
+
+```sh
+make docker-generate-protobuf
+```
+
+## Bump dependencies
+
+To bump all dependencies run:
+
+```sh
+go get -u -t ./...
+go mod tidy
+```
diff --git a/src/checkout/genproto/Dockerfile b/src/checkout/genproto/Dockerfile
new file mode 100644
index 0000000..5bc391c
--- /dev/null
+++ b/src/checkout/genproto/Dockerfile
@@ -0,0 +1,13 @@
+# Copyright The OpenTelemetry Authors
+# SPDX-License-Identifier: Apache-2.0
+
+FROM golang:1.24-alpine
+
+WORKDIR /build
+
+RUN apk add --no-cache protobuf-dev
+
+COPY ./src/checkout/go.mod go.mod
+COPY ./src/checkout/go.sum go.sum
+
+RUN go install tool
diff --git a/src/checkout/genproto/oteldemo/demo.pb.go b/src/checkout/genproto/oteldemo/demo.pb.go
new file mode 100644
index 0000000..7094aa3
--- /dev/null
+++ b/src/checkout/genproto/oteldemo/demo.pb.go
@@ -0,0 +1,2544 @@
+// Copyright 2020 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.36.9
+// 	protoc        v5.29.4
+// source: demo.proto
+
+package oteldemo
+
+import (
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+	unsafe "unsafe"
+)
+
+const (
+	// Verify that this generated code is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+	// Verify that runtime/protoimpl is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
+)
+
+type CartItem struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	ProductId     string                 `protobuf:"bytes,1,opt,name=product_id,json=productId,proto3" json:"product_id,omitempty"`
+	Quantity      int32                  `protobuf:"varint,2,opt,name=quantity,proto3" json:"quantity,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *CartItem) Reset() {
+	*x = CartItem{}
+	mi := &file_demo_proto_msgTypes[0]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *CartItem) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*CartItem) ProtoMessage() {}
+
+func (x *CartItem) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[0]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use CartItem.ProtoReflect.Descriptor instead.
+func (*CartItem) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *CartItem) GetProductId() string {
+	if x != nil {
+		return x.ProductId
+	}
+	return ""
+}
+
+func (x *CartItem) GetQuantity() int32 {
+	if x != nil {
+		return x.Quantity
+	}
+	return 0
+}
+
+type AddItemRequest struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	UserId        string                 `protobuf:"bytes,1,opt,name=user_id,json=userId,proto3" json:"user_id,omitempty"`
+	Item          *CartItem              `protobuf:"bytes,2,opt,name=item,proto3" json:"item,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *AddItemRequest) Reset() {
+	*x = AddItemRequest{}
+	mi := &file_demo_proto_msgTypes[1]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *AddItemRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*AddItemRequest) ProtoMessage() {}
+
+func (x *AddItemRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[1]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use AddItemRequest.ProtoReflect.Descriptor instead.
+func (*AddItemRequest) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{1}
+}
+
+func (x *AddItemRequest) GetUserId() string {
+	if x != nil {
+		return x.UserId
+	}
+	return ""
+}
+
+func (x *AddItemRequest) GetItem() *CartItem {
+	if x != nil {
+		return x.Item
+	}
+	return nil
+}
+
+type EmptyCartRequest struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	UserId        string                 `protobuf:"bytes,1,opt,name=user_id,json=userId,proto3" json:"user_id,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *EmptyCartRequest) Reset() {
+	*x = EmptyCartRequest{}
+	mi := &file_demo_proto_msgTypes[2]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *EmptyCartRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*EmptyCartRequest) ProtoMessage() {}
+
+func (x *EmptyCartRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[2]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use EmptyCartRequest.ProtoReflect.Descriptor instead.
+func (*EmptyCartRequest) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{2}
+}
+
+func (x *EmptyCartRequest) GetUserId() string {
+	if x != nil {
+		return x.UserId
+	}
+	return ""
+}
+
+type GetCartRequest struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	UserId        string                 `protobuf:"bytes,1,opt,name=user_id,json=userId,proto3" json:"user_id,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *GetCartRequest) Reset() {
+	*x = GetCartRequest{}
+	mi := &file_demo_proto_msgTypes[3]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *GetCartRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*GetCartRequest) ProtoMessage() {}
+
+func (x *GetCartRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[3]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use GetCartRequest.ProtoReflect.Descriptor instead.
+func (*GetCartRequest) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{3}
+}
+
+func (x *GetCartRequest) GetUserId() string {
+	if x != nil {
+		return x.UserId
+	}
+	return ""
+}
+
+type Cart struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	UserId        string                 `protobuf:"bytes,1,opt,name=user_id,json=userId,proto3" json:"user_id,omitempty"`
+	Items         []*CartItem            `protobuf:"bytes,2,rep,name=items,proto3" json:"items,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *Cart) Reset() {
+	*x = Cart{}
+	mi := &file_demo_proto_msgTypes[4]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *Cart) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Cart) ProtoMessage() {}
+
+func (x *Cart) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[4]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Cart.ProtoReflect.Descriptor instead.
+func (*Cart) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{4}
+}
+
+func (x *Cart) GetUserId() string {
+	if x != nil {
+		return x.UserId
+	}
+	return ""
+}
+
+func (x *Cart) GetItems() []*CartItem {
+	if x != nil {
+		return x.Items
+	}
+	return nil
+}
+
+type Empty struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *Empty) Reset() {
+	*x = Empty{}
+	mi := &file_demo_proto_msgTypes[5]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *Empty) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Empty) ProtoMessage() {}
+
+func (x *Empty) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[5]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Empty.ProtoReflect.Descriptor instead.
+func (*Empty) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{5}
+}
+
+type ListRecommendationsRequest struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	UserId        string                 `protobuf:"bytes,1,opt,name=user_id,json=userId,proto3" json:"user_id,omitempty"`
+	ProductIds    []string               `protobuf:"bytes,2,rep,name=product_ids,json=productIds,proto3" json:"product_ids,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *ListRecommendationsRequest) Reset() {
+	*x = ListRecommendationsRequest{}
+	mi := &file_demo_proto_msgTypes[6]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *ListRecommendationsRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ListRecommendationsRequest) ProtoMessage() {}
+
+func (x *ListRecommendationsRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[6]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ListRecommendationsRequest.ProtoReflect.Descriptor instead.
+func (*ListRecommendationsRequest) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{6}
+}
+
+func (x *ListRecommendationsRequest) GetUserId() string {
+	if x != nil {
+		return x.UserId
+	}
+	return ""
+}
+
+func (x *ListRecommendationsRequest) GetProductIds() []string {
+	if x != nil {
+		return x.ProductIds
+	}
+	return nil
+}
+
+type ListRecommendationsResponse struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	ProductIds    []string               `protobuf:"bytes,1,rep,name=product_ids,json=productIds,proto3" json:"product_ids,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *ListRecommendationsResponse) Reset() {
+	*x = ListRecommendationsResponse{}
+	mi := &file_demo_proto_msgTypes[7]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *ListRecommendationsResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ListRecommendationsResponse) ProtoMessage() {}
+
+func (x *ListRecommendationsResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[7]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ListRecommendationsResponse.ProtoReflect.Descriptor instead.
+func (*ListRecommendationsResponse) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{7}
+}
+
+func (x *ListRecommendationsResponse) GetProductIds() []string {
+	if x != nil {
+		return x.ProductIds
+	}
+	return nil
+}
+
+type Product struct {
+	state       protoimpl.MessageState `protogen:"open.v1"`
+	Id          string                 `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
+	Name        string                 `protobuf:"bytes,2,opt,name=name,proto3" json:"name,omitempty"`
+	Description string                 `protobuf:"bytes,3,opt,name=description,proto3" json:"description,omitempty"`
+	Picture     string                 `protobuf:"bytes,4,opt,name=picture,proto3" json:"picture,omitempty"`
+	PriceUsd    *Money                 `protobuf:"bytes,5,opt,name=price_usd,json=priceUsd,proto3" json:"price_usd,omitempty"`
+	// Categories such as "clothing" or "kitchen" that can be used to look up
+	// other related products.
+	Categories    []string `protobuf:"bytes,6,rep,name=categories,proto3" json:"categories,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *Product) Reset() {
+	*x = Product{}
+	mi := &file_demo_proto_msgTypes[8]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *Product) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Product) ProtoMessage() {}
+
+func (x *Product) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[8]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Product.ProtoReflect.Descriptor instead.
+func (*Product) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{8}
+}
+
+func (x *Product) GetId() string {
+	if x != nil {
+		return x.Id
+	}
+	return ""
+}
+
+func (x *Product) GetName() string {
+	if x != nil {
+		return x.Name
+	}
+	return ""
+}
+
+func (x *Product) GetDescription() string {
+	if x != nil {
+		return x.Description
+	}
+	return ""
+}
+
+func (x *Product) GetPicture() string {
+	if x != nil {
+		return x.Picture
+	}
+	return ""
+}
+
+func (x *Product) GetPriceUsd() *Money {
+	if x != nil {
+		return x.PriceUsd
+	}
+	return nil
+}
+
+func (x *Product) GetCategories() []string {
+	if x != nil {
+		return x.Categories
+	}
+	return nil
+}
+
+type ListProductsResponse struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	Products      []*Product             `protobuf:"bytes,1,rep,name=products,proto3" json:"products,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *ListProductsResponse) Reset() {
+	*x = ListProductsResponse{}
+	mi := &file_demo_proto_msgTypes[9]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *ListProductsResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ListProductsResponse) ProtoMessage() {}
+
+func (x *ListProductsResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[9]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ListProductsResponse.ProtoReflect.Descriptor instead.
+func (*ListProductsResponse) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{9}
+}
+
+func (x *ListProductsResponse) GetProducts() []*Product {
+	if x != nil {
+		return x.Products
+	}
+	return nil
+}
+
+type GetProductRequest struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	Id            string                 `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *GetProductRequest) Reset() {
+	*x = GetProductRequest{}
+	mi := &file_demo_proto_msgTypes[10]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *GetProductRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*GetProductRequest) ProtoMessage() {}
+
+func (x *GetProductRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[10]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use GetProductRequest.ProtoReflect.Descriptor instead.
+func (*GetProductRequest) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{10}
+}
+
+func (x *GetProductRequest) GetId() string {
+	if x != nil {
+		return x.Id
+	}
+	return ""
+}
+
+type SearchProductsRequest struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	Query         string                 `protobuf:"bytes,1,opt,name=query,proto3" json:"query,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *SearchProductsRequest) Reset() {
+	*x = SearchProductsRequest{}
+	mi := &file_demo_proto_msgTypes[11]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *SearchProductsRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*SearchProductsRequest) ProtoMessage() {}
+
+func (x *SearchProductsRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[11]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use SearchProductsRequest.ProtoReflect.Descriptor instead.
+func (*SearchProductsRequest) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{11}
+}
+
+func (x *SearchProductsRequest) GetQuery() string {
+	if x != nil {
+		return x.Query
+	}
+	return ""
+}
+
+type SearchProductsResponse struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	Results       []*Product             `protobuf:"bytes,1,rep,name=results,proto3" json:"results,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *SearchProductsResponse) Reset() {
+	*x = SearchProductsResponse{}
+	mi := &file_demo_proto_msgTypes[12]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *SearchProductsResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*SearchProductsResponse) ProtoMessage() {}
+
+func (x *SearchProductsResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[12]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use SearchProductsResponse.ProtoReflect.Descriptor instead.
+func (*SearchProductsResponse) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{12}
+}
+
+func (x *SearchProductsResponse) GetResults() []*Product {
+	if x != nil {
+		return x.Results
+	}
+	return nil
+}
+
+type GetQuoteRequest struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	Address       *Address               `protobuf:"bytes,1,opt,name=address,proto3" json:"address,omitempty"`
+	Items         []*CartItem            `protobuf:"bytes,2,rep,name=items,proto3" json:"items,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *GetQuoteRequest) Reset() {
+	*x = GetQuoteRequest{}
+	mi := &file_demo_proto_msgTypes[13]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *GetQuoteRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*GetQuoteRequest) ProtoMessage() {}
+
+func (x *GetQuoteRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[13]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use GetQuoteRequest.ProtoReflect.Descriptor instead.
+func (*GetQuoteRequest) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{13}
+}
+
+func (x *GetQuoteRequest) GetAddress() *Address {
+	if x != nil {
+		return x.Address
+	}
+	return nil
+}
+
+func (x *GetQuoteRequest) GetItems() []*CartItem {
+	if x != nil {
+		return x.Items
+	}
+	return nil
+}
+
+type GetQuoteResponse struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	CostUsd       *Money                 `protobuf:"bytes,1,opt,name=cost_usd,json=costUsd,proto3" json:"cost_usd,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *GetQuoteResponse) Reset() {
+	*x = GetQuoteResponse{}
+	mi := &file_demo_proto_msgTypes[14]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *GetQuoteResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*GetQuoteResponse) ProtoMessage() {}
+
+func (x *GetQuoteResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[14]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use GetQuoteResponse.ProtoReflect.Descriptor instead.
+func (*GetQuoteResponse) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{14}
+}
+
+func (x *GetQuoteResponse) GetCostUsd() *Money {
+	if x != nil {
+		return x.CostUsd
+	}
+	return nil
+}
+
+type ShipOrderRequest struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	Address       *Address               `protobuf:"bytes,1,opt,name=address,proto3" json:"address,omitempty"`
+	Items         []*CartItem            `protobuf:"bytes,2,rep,name=items,proto3" json:"items,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *ShipOrderRequest) Reset() {
+	*x = ShipOrderRequest{}
+	mi := &file_demo_proto_msgTypes[15]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *ShipOrderRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ShipOrderRequest) ProtoMessage() {}
+
+func (x *ShipOrderRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[15]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ShipOrderRequest.ProtoReflect.Descriptor instead.
+func (*ShipOrderRequest) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{15}
+}
+
+func (x *ShipOrderRequest) GetAddress() *Address {
+	if x != nil {
+		return x.Address
+	}
+	return nil
+}
+
+func (x *ShipOrderRequest) GetItems() []*CartItem {
+	if x != nil {
+		return x.Items
+	}
+	return nil
+}
+
+type ShipOrderResponse struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	TrackingId    string                 `protobuf:"bytes,1,opt,name=tracking_id,json=trackingId,proto3" json:"tracking_id,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *ShipOrderResponse) Reset() {
+	*x = ShipOrderResponse{}
+	mi := &file_demo_proto_msgTypes[16]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *ShipOrderResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ShipOrderResponse) ProtoMessage() {}
+
+func (x *ShipOrderResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[16]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ShipOrderResponse.ProtoReflect.Descriptor instead.
+func (*ShipOrderResponse) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{16}
+}
+
+func (x *ShipOrderResponse) GetTrackingId() string {
+	if x != nil {
+		return x.TrackingId
+	}
+	return ""
+}
+
+type Address struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	StreetAddress string                 `protobuf:"bytes,1,opt,name=street_address,json=streetAddress,proto3" json:"street_address,omitempty"`
+	City          string                 `protobuf:"bytes,2,opt,name=city,proto3" json:"city,omitempty"`
+	State         string                 `protobuf:"bytes,3,opt,name=state,proto3" json:"state,omitempty"`
+	Country       string                 `protobuf:"bytes,4,opt,name=country,proto3" json:"country,omitempty"`
+	ZipCode       string                 `protobuf:"bytes,5,opt,name=zip_code,json=zipCode,proto3" json:"zip_code,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *Address) Reset() {
+	*x = Address{}
+	mi := &file_demo_proto_msgTypes[17]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *Address) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Address) ProtoMessage() {}
+
+func (x *Address) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[17]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Address.ProtoReflect.Descriptor instead.
+func (*Address) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{17}
+}
+
+func (x *Address) GetStreetAddress() string {
+	if x != nil {
+		return x.StreetAddress
+	}
+	return ""
+}
+
+func (x *Address) GetCity() string {
+	if x != nil {
+		return x.City
+	}
+	return ""
+}
+
+func (x *Address) GetState() string {
+	if x != nil {
+		return x.State
+	}
+	return ""
+}
+
+func (x *Address) GetCountry() string {
+	if x != nil {
+		return x.Country
+	}
+	return ""
+}
+
+func (x *Address) GetZipCode() string {
+	if x != nil {
+		return x.ZipCode
+	}
+	return ""
+}
+
+// Represents an amount of money with its currency type.
+type Money struct {
+	state protoimpl.MessageState `protogen:"open.v1"`
+	// The 3-letter currency code defined in ISO 4217.
+	CurrencyCode string `protobuf:"bytes,1,opt,name=currency_code,json=currencyCode,proto3" json:"currency_code,omitempty"`
+	// The whole units of the amount.
+	// For example if `currencyCode` is `"USD"`, then 1 unit is one US dollar.
+	Units int64 `protobuf:"varint,2,opt,name=units,proto3" json:"units,omitempty"`
+	// Number of nano (10^-9) units of the amount.
+	// The value must be between -999,999,999 and +999,999,999 inclusive.
+	// If `units` is positive, `nanos` must be positive or zero.
+	// If `units` is zero, `nanos` can be positive, zero, or negative.
+	// If `units` is negative, `nanos` must be negative or zero.
+	// For example $-1.75 is represented as `units`=-1 and `nanos`=-750,000,000.
+	Nanos         int32 `protobuf:"varint,3,opt,name=nanos,proto3" json:"nanos,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *Money) Reset() {
+	*x = Money{}
+	mi := &file_demo_proto_msgTypes[18]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *Money) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Money) ProtoMessage() {}
+
+func (x *Money) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[18]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Money.ProtoReflect.Descriptor instead.
+func (*Money) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{18}
+}
+
+func (x *Money) GetCurrencyCode() string {
+	if x != nil {
+		return x.CurrencyCode
+	}
+	return ""
+}
+
+func (x *Money) GetUnits() int64 {
+	if x != nil {
+		return x.Units
+	}
+	return 0
+}
+
+func (x *Money) GetNanos() int32 {
+	if x != nil {
+		return x.Nanos
+	}
+	return 0
+}
+
+type GetSupportedCurrenciesResponse struct {
+	state protoimpl.MessageState `protogen:"open.v1"`
+	// The 3-letter currency code defined in ISO 4217.
+	CurrencyCodes []string `protobuf:"bytes,1,rep,name=currency_codes,json=currencyCodes,proto3" json:"currency_codes,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *GetSupportedCurrenciesResponse) Reset() {
+	*x = GetSupportedCurrenciesResponse{}
+	mi := &file_demo_proto_msgTypes[19]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *GetSupportedCurrenciesResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*GetSupportedCurrenciesResponse) ProtoMessage() {}
+
+func (x *GetSupportedCurrenciesResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[19]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use GetSupportedCurrenciesResponse.ProtoReflect.Descriptor instead.
+func (*GetSupportedCurrenciesResponse) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{19}
+}
+
+func (x *GetSupportedCurrenciesResponse) GetCurrencyCodes() []string {
+	if x != nil {
+		return x.CurrencyCodes
+	}
+	return nil
+}
+
+type CurrencyConversionRequest struct {
+	state protoimpl.MessageState `protogen:"open.v1"`
+	From  *Money                 `protobuf:"bytes,1,opt,name=from,proto3" json:"from,omitempty"`
+	// The 3-letter currency code defined in ISO 4217.
+	ToCode        string `protobuf:"bytes,2,opt,name=to_code,json=toCode,proto3" json:"to_code,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *CurrencyConversionRequest) Reset() {
+	*x = CurrencyConversionRequest{}
+	mi := &file_demo_proto_msgTypes[20]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *CurrencyConversionRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*CurrencyConversionRequest) ProtoMessage() {}
+
+func (x *CurrencyConversionRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[20]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use CurrencyConversionRequest.ProtoReflect.Descriptor instead.
+func (*CurrencyConversionRequest) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{20}
+}
+
+func (x *CurrencyConversionRequest) GetFrom() *Money {
+	if x != nil {
+		return x.From
+	}
+	return nil
+}
+
+func (x *CurrencyConversionRequest) GetToCode() string {
+	if x != nil {
+		return x.ToCode
+	}
+	return ""
+}
+
+type CreditCardInfo struct {
+	state                     protoimpl.MessageState `protogen:"open.v1"`
+	CreditCardNumber          string                 `protobuf:"bytes,1,opt,name=credit_card_number,json=creditCardNumber,proto3" json:"credit_card_number,omitempty"`
+	CreditCardCvv             int32                  `protobuf:"varint,2,opt,name=credit_card_cvv,json=creditCardCvv,proto3" json:"credit_card_cvv,omitempty"`
+	CreditCardExpirationYear  int32                  `protobuf:"varint,3,opt,name=credit_card_expiration_year,json=creditCardExpirationYear,proto3" json:"credit_card_expiration_year,omitempty"`
+	CreditCardExpirationMonth int32                  `protobuf:"varint,4,opt,name=credit_card_expiration_month,json=creditCardExpirationMonth,proto3" json:"credit_card_expiration_month,omitempty"`
+	unknownFields             protoimpl.UnknownFields
+	sizeCache                 protoimpl.SizeCache
+}
+
+func (x *CreditCardInfo) Reset() {
+	*x = CreditCardInfo{}
+	mi := &file_demo_proto_msgTypes[21]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *CreditCardInfo) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*CreditCardInfo) ProtoMessage() {}
+
+func (x *CreditCardInfo) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[21]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use CreditCardInfo.ProtoReflect.Descriptor instead.
+func (*CreditCardInfo) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{21}
+}
+
+func (x *CreditCardInfo) GetCreditCardNumber() string {
+	if x != nil {
+		return x.CreditCardNumber
+	}
+	return ""
+}
+
+func (x *CreditCardInfo) GetCreditCardCvv() int32 {
+	if x != nil {
+		return x.CreditCardCvv
+	}
+	return 0
+}
+
+func (x *CreditCardInfo) GetCreditCardExpirationYear() int32 {
+	if x != nil {
+		return x.CreditCardExpirationYear
+	}
+	return 0
+}
+
+func (x *CreditCardInfo) GetCreditCardExpirationMonth() int32 {
+	if x != nil {
+		return x.CreditCardExpirationMonth
+	}
+	return 0
+}
+
+type ChargeRequest struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	Amount        *Money                 `protobuf:"bytes,1,opt,name=amount,proto3" json:"amount,omitempty"`
+	CreditCard    *CreditCardInfo        `protobuf:"bytes,2,opt,name=credit_card,json=creditCard,proto3" json:"credit_card,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *ChargeRequest) Reset() {
+	*x = ChargeRequest{}
+	mi := &file_demo_proto_msgTypes[22]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *ChargeRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ChargeRequest) ProtoMessage() {}
+
+func (x *ChargeRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[22]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ChargeRequest.ProtoReflect.Descriptor instead.
+func (*ChargeRequest) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{22}
+}
+
+func (x *ChargeRequest) GetAmount() *Money {
+	if x != nil {
+		return x.Amount
+	}
+	return nil
+}
+
+func (x *ChargeRequest) GetCreditCard() *CreditCardInfo {
+	if x != nil {
+		return x.CreditCard
+	}
+	return nil
+}
+
+type ChargeResponse struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	TransactionId string                 `protobuf:"bytes,1,opt,name=transaction_id,json=transactionId,proto3" json:"transaction_id,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *ChargeResponse) Reset() {
+	*x = ChargeResponse{}
+	mi := &file_demo_proto_msgTypes[23]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *ChargeResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ChargeResponse) ProtoMessage() {}
+
+func (x *ChargeResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[23]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ChargeResponse.ProtoReflect.Descriptor instead.
+func (*ChargeResponse) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{23}
+}
+
+func (x *ChargeResponse) GetTransactionId() string {
+	if x != nil {
+		return x.TransactionId
+	}
+	return ""
+}
+
+type OrderItem struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	Item          *CartItem              `protobuf:"bytes,1,opt,name=item,proto3" json:"item,omitempty"`
+	Cost          *Money                 `protobuf:"bytes,2,opt,name=cost,proto3" json:"cost,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *OrderItem) Reset() {
+	*x = OrderItem{}
+	mi := &file_demo_proto_msgTypes[24]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *OrderItem) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*OrderItem) ProtoMessage() {}
+
+func (x *OrderItem) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[24]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use OrderItem.ProtoReflect.Descriptor instead.
+func (*OrderItem) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{24}
+}
+
+func (x *OrderItem) GetItem() *CartItem {
+	if x != nil {
+		return x.Item
+	}
+	return nil
+}
+
+func (x *OrderItem) GetCost() *Money {
+	if x != nil {
+		return x.Cost
+	}
+	return nil
+}
+
+type OrderResult struct {
+	state              protoimpl.MessageState `protogen:"open.v1"`
+	OrderId            string                 `protobuf:"bytes,1,opt,name=order_id,json=orderId,proto3" json:"order_id,omitempty"`
+	ShippingTrackingId string                 `protobuf:"bytes,2,opt,name=shipping_tracking_id,json=shippingTrackingId,proto3" json:"shipping_tracking_id,omitempty"`
+	ShippingCost       *Money                 `protobuf:"bytes,3,opt,name=shipping_cost,json=shippingCost,proto3" json:"shipping_cost,omitempty"`
+	ShippingAddress    *Address               `protobuf:"bytes,4,opt,name=shipping_address,json=shippingAddress,proto3" json:"shipping_address,omitempty"`
+	Items              []*OrderItem           `protobuf:"bytes,5,rep,name=items,proto3" json:"items,omitempty"`
+	unknownFields      protoimpl.UnknownFields
+	sizeCache          protoimpl.SizeCache
+}
+
+func (x *OrderResult) Reset() {
+	*x = OrderResult{}
+	mi := &file_demo_proto_msgTypes[25]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *OrderResult) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*OrderResult) ProtoMessage() {}
+
+func (x *OrderResult) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[25]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use OrderResult.ProtoReflect.Descriptor instead.
+func (*OrderResult) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{25}
+}
+
+func (x *OrderResult) GetOrderId() string {
+	if x != nil {
+		return x.OrderId
+	}
+	return ""
+}
+
+func (x *OrderResult) GetShippingTrackingId() string {
+	if x != nil {
+		return x.ShippingTrackingId
+	}
+	return ""
+}
+
+func (x *OrderResult) GetShippingCost() *Money {
+	if x != nil {
+		return x.ShippingCost
+	}
+	return nil
+}
+
+func (x *OrderResult) GetShippingAddress() *Address {
+	if x != nil {
+		return x.ShippingAddress
+	}
+	return nil
+}
+
+func (x *OrderResult) GetItems() []*OrderItem {
+	if x != nil {
+		return x.Items
+	}
+	return nil
+}
+
+type SendOrderConfirmationRequest struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	Email         string                 `protobuf:"bytes,1,opt,name=email,proto3" json:"email,omitempty"`
+	Order         *OrderResult           `protobuf:"bytes,2,opt,name=order,proto3" json:"order,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *SendOrderConfirmationRequest) Reset() {
+	*x = SendOrderConfirmationRequest{}
+	mi := &file_demo_proto_msgTypes[26]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *SendOrderConfirmationRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*SendOrderConfirmationRequest) ProtoMessage() {}
+
+func (x *SendOrderConfirmationRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[26]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use SendOrderConfirmationRequest.ProtoReflect.Descriptor instead.
+func (*SendOrderConfirmationRequest) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{26}
+}
+
+func (x *SendOrderConfirmationRequest) GetEmail() string {
+	if x != nil {
+		return x.Email
+	}
+	return ""
+}
+
+func (x *SendOrderConfirmationRequest) GetOrder() *OrderResult {
+	if x != nil {
+		return x.Order
+	}
+	return nil
+}
+
+type PlaceOrderRequest struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	UserId        string                 `protobuf:"bytes,1,opt,name=user_id,json=userId,proto3" json:"user_id,omitempty"`
+	UserCurrency  string                 `protobuf:"bytes,2,opt,name=user_currency,json=userCurrency,proto3" json:"user_currency,omitempty"`
+	Address       *Address               `protobuf:"bytes,3,opt,name=address,proto3" json:"address,omitempty"`
+	Email         string                 `protobuf:"bytes,5,opt,name=email,proto3" json:"email,omitempty"`
+	CreditCard    *CreditCardInfo        `protobuf:"bytes,6,opt,name=credit_card,json=creditCard,proto3" json:"credit_card,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *PlaceOrderRequest) Reset() {
+	*x = PlaceOrderRequest{}
+	mi := &file_demo_proto_msgTypes[27]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *PlaceOrderRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*PlaceOrderRequest) ProtoMessage() {}
+
+func (x *PlaceOrderRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[27]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use PlaceOrderRequest.ProtoReflect.Descriptor instead.
+func (*PlaceOrderRequest) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{27}
+}
+
+func (x *PlaceOrderRequest) GetUserId() string {
+	if x != nil {
+		return x.UserId
+	}
+	return ""
+}
+
+func (x *PlaceOrderRequest) GetUserCurrency() string {
+	if x != nil {
+		return x.UserCurrency
+	}
+	return ""
+}
+
+func (x *PlaceOrderRequest) GetAddress() *Address {
+	if x != nil {
+		return x.Address
+	}
+	return nil
+}
+
+func (x *PlaceOrderRequest) GetEmail() string {
+	if x != nil {
+		return x.Email
+	}
+	return ""
+}
+
+func (x *PlaceOrderRequest) GetCreditCard() *CreditCardInfo {
+	if x != nil {
+		return x.CreditCard
+	}
+	return nil
+}
+
+type PlaceOrderResponse struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	Order         *OrderResult           `protobuf:"bytes,1,opt,name=order,proto3" json:"order,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *PlaceOrderResponse) Reset() {
+	*x = PlaceOrderResponse{}
+	mi := &file_demo_proto_msgTypes[28]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *PlaceOrderResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*PlaceOrderResponse) ProtoMessage() {}
+
+func (x *PlaceOrderResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[28]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use PlaceOrderResponse.ProtoReflect.Descriptor instead.
+func (*PlaceOrderResponse) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{28}
+}
+
+func (x *PlaceOrderResponse) GetOrder() *OrderResult {
+	if x != nil {
+		return x.Order
+	}
+	return nil
+}
+
+type AdRequest struct {
+	state protoimpl.MessageState `protogen:"open.v1"`
+	// List of important key words from the current page describing the context.
+	ContextKeys   []string `protobuf:"bytes,1,rep,name=context_keys,json=contextKeys,proto3" json:"context_keys,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *AdRequest) Reset() {
+	*x = AdRequest{}
+	mi := &file_demo_proto_msgTypes[29]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *AdRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*AdRequest) ProtoMessage() {}
+
+func (x *AdRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[29]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use AdRequest.ProtoReflect.Descriptor instead.
+func (*AdRequest) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{29}
+}
+
+func (x *AdRequest) GetContextKeys() []string {
+	if x != nil {
+		return x.ContextKeys
+	}
+	return nil
+}
+
+type AdResponse struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	Ads           []*Ad                  `protobuf:"bytes,1,rep,name=ads,proto3" json:"ads,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *AdResponse) Reset() {
+	*x = AdResponse{}
+	mi := &file_demo_proto_msgTypes[30]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *AdResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*AdResponse) ProtoMessage() {}
+
+func (x *AdResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[30]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use AdResponse.ProtoReflect.Descriptor instead.
+func (*AdResponse) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{30}
+}
+
+func (x *AdResponse) GetAds() []*Ad {
+	if x != nil {
+		return x.Ads
+	}
+	return nil
+}
+
+type Ad struct {
+	state protoimpl.MessageState `protogen:"open.v1"`
+	// url to redirect to when an ad is clicked.
+	RedirectUrl string `protobuf:"bytes,1,opt,name=redirect_url,json=redirectUrl,proto3" json:"redirect_url,omitempty"`
+	// short advertisement text to display.
+	Text          string `protobuf:"bytes,2,opt,name=text,proto3" json:"text,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *Ad) Reset() {
+	*x = Ad{}
+	mi := &file_demo_proto_msgTypes[31]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *Ad) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Ad) ProtoMessage() {}
+
+func (x *Ad) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[31]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Ad.ProtoReflect.Descriptor instead.
+func (*Ad) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{31}
+}
+
+func (x *Ad) GetRedirectUrl() string {
+	if x != nil {
+		return x.RedirectUrl
+	}
+	return ""
+}
+
+func (x *Ad) GetText() string {
+	if x != nil {
+		return x.Text
+	}
+	return ""
+}
+
+type Flag struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	Name          string                 `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
+	Description   string                 `protobuf:"bytes,2,opt,name=description,proto3" json:"description,omitempty"`
+	Enabled       bool                   `protobuf:"varint,3,opt,name=enabled,proto3" json:"enabled,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *Flag) Reset() {
+	*x = Flag{}
+	mi := &file_demo_proto_msgTypes[32]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *Flag) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Flag) ProtoMessage() {}
+
+func (x *Flag) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[32]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Flag.ProtoReflect.Descriptor instead.
+func (*Flag) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{32}
+}
+
+func (x *Flag) GetName() string {
+	if x != nil {
+		return x.Name
+	}
+	return ""
+}
+
+func (x *Flag) GetDescription() string {
+	if x != nil {
+		return x.Description
+	}
+	return ""
+}
+
+func (x *Flag) GetEnabled() bool {
+	if x != nil {
+		return x.Enabled
+	}
+	return false
+}
+
+type GetFlagRequest struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	Name          string                 `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *GetFlagRequest) Reset() {
+	*x = GetFlagRequest{}
+	mi := &file_demo_proto_msgTypes[33]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *GetFlagRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*GetFlagRequest) ProtoMessage() {}
+
+func (x *GetFlagRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[33]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use GetFlagRequest.ProtoReflect.Descriptor instead.
+func (*GetFlagRequest) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{33}
+}
+
+func (x *GetFlagRequest) GetName() string {
+	if x != nil {
+		return x.Name
+	}
+	return ""
+}
+
+type GetFlagResponse struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	Flag          *Flag                  `protobuf:"bytes,1,opt,name=flag,proto3" json:"flag,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *GetFlagResponse) Reset() {
+	*x = GetFlagResponse{}
+	mi := &file_demo_proto_msgTypes[34]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *GetFlagResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*GetFlagResponse) ProtoMessage() {}
+
+func (x *GetFlagResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[34]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use GetFlagResponse.ProtoReflect.Descriptor instead.
+func (*GetFlagResponse) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{34}
+}
+
+func (x *GetFlagResponse) GetFlag() *Flag {
+	if x != nil {
+		return x.Flag
+	}
+	return nil
+}
+
+type CreateFlagRequest struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	Name          string                 `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
+	Description   string                 `protobuf:"bytes,2,opt,name=description,proto3" json:"description,omitempty"`
+	Enabled       bool                   `protobuf:"varint,3,opt,name=enabled,proto3" json:"enabled,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *CreateFlagRequest) Reset() {
+	*x = CreateFlagRequest{}
+	mi := &file_demo_proto_msgTypes[35]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *CreateFlagRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*CreateFlagRequest) ProtoMessage() {}
+
+func (x *CreateFlagRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[35]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use CreateFlagRequest.ProtoReflect.Descriptor instead.
+func (*CreateFlagRequest) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{35}
+}
+
+func (x *CreateFlagRequest) GetName() string {
+	if x != nil {
+		return x.Name
+	}
+	return ""
+}
+
+func (x *CreateFlagRequest) GetDescription() string {
+	if x != nil {
+		return x.Description
+	}
+	return ""
+}
+
+func (x *CreateFlagRequest) GetEnabled() bool {
+	if x != nil {
+		return x.Enabled
+	}
+	return false
+}
+
+type CreateFlagResponse struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	Flag          *Flag                  `protobuf:"bytes,1,opt,name=flag,proto3" json:"flag,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *CreateFlagResponse) Reset() {
+	*x = CreateFlagResponse{}
+	mi := &file_demo_proto_msgTypes[36]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *CreateFlagResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*CreateFlagResponse) ProtoMessage() {}
+
+func (x *CreateFlagResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[36]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use CreateFlagResponse.ProtoReflect.Descriptor instead.
+func (*CreateFlagResponse) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{36}
+}
+
+func (x *CreateFlagResponse) GetFlag() *Flag {
+	if x != nil {
+		return x.Flag
+	}
+	return nil
+}
+
+type UpdateFlagRequest struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	Name          string                 `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
+	Enabled       bool                   `protobuf:"varint,2,opt,name=enabled,proto3" json:"enabled,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *UpdateFlagRequest) Reset() {
+	*x = UpdateFlagRequest{}
+	mi := &file_demo_proto_msgTypes[37]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *UpdateFlagRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*UpdateFlagRequest) ProtoMessage() {}
+
+func (x *UpdateFlagRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[37]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use UpdateFlagRequest.ProtoReflect.Descriptor instead.
+func (*UpdateFlagRequest) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{37}
+}
+
+func (x *UpdateFlagRequest) GetName() string {
+	if x != nil {
+		return x.Name
+	}
+	return ""
+}
+
+func (x *UpdateFlagRequest) GetEnabled() bool {
+	if x != nil {
+		return x.Enabled
+	}
+	return false
+}
+
+type UpdateFlagResponse struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *UpdateFlagResponse) Reset() {
+	*x = UpdateFlagResponse{}
+	mi := &file_demo_proto_msgTypes[38]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *UpdateFlagResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*UpdateFlagResponse) ProtoMessage() {}
+
+func (x *UpdateFlagResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[38]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use UpdateFlagResponse.ProtoReflect.Descriptor instead.
+func (*UpdateFlagResponse) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{38}
+}
+
+type ListFlagsRequest struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *ListFlagsRequest) Reset() {
+	*x = ListFlagsRequest{}
+	mi := &file_demo_proto_msgTypes[39]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *ListFlagsRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ListFlagsRequest) ProtoMessage() {}
+
+func (x *ListFlagsRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[39]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ListFlagsRequest.ProtoReflect.Descriptor instead.
+func (*ListFlagsRequest) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{39}
+}
+
+type ListFlagsResponse struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	Flag          []*Flag                `protobuf:"bytes,1,rep,name=flag,proto3" json:"flag,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *ListFlagsResponse) Reset() {
+	*x = ListFlagsResponse{}
+	mi := &file_demo_proto_msgTypes[40]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *ListFlagsResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ListFlagsResponse) ProtoMessage() {}
+
+func (x *ListFlagsResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[40]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ListFlagsResponse.ProtoReflect.Descriptor instead.
+func (*ListFlagsResponse) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{40}
+}
+
+func (x *ListFlagsResponse) GetFlag() []*Flag {
+	if x != nil {
+		return x.Flag
+	}
+	return nil
+}
+
+type DeleteFlagRequest struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	Name          string                 `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *DeleteFlagRequest) Reset() {
+	*x = DeleteFlagRequest{}
+	mi := &file_demo_proto_msgTypes[41]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *DeleteFlagRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*DeleteFlagRequest) ProtoMessage() {}
+
+func (x *DeleteFlagRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[41]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use DeleteFlagRequest.ProtoReflect.Descriptor instead.
+func (*DeleteFlagRequest) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{41}
+}
+
+func (x *DeleteFlagRequest) GetName() string {
+	if x != nil {
+		return x.Name
+	}
+	return ""
+}
+
+type DeleteFlagResponse struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *DeleteFlagResponse) Reset() {
+	*x = DeleteFlagResponse{}
+	mi := &file_demo_proto_msgTypes[42]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *DeleteFlagResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*DeleteFlagResponse) ProtoMessage() {}
+
+func (x *DeleteFlagResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[42]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use DeleteFlagResponse.ProtoReflect.Descriptor instead.
+func (*DeleteFlagResponse) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{42}
+}
+
+var File_demo_proto protoreflect.FileDescriptor
+
+const file_demo_proto_rawDesc = "" +
+	"\n" +
+	"\n" +
+	"demo.proto\x12\boteldemo\"E\n" +
+	"\bCartItem\x12\x1d\n" +
+	"\n" +
+	"product_id\x18\x01 \x01(\tR\tproductId\x12\x1a\n" +
+	"\bquantity\x18\x02 \x01(\x05R\bquantity\"Q\n" +
+	"\x0eAddItemRequest\x12\x17\n" +
+	"\auser_id\x18\x01 \x01(\tR\x06userId\x12&\n" +
+	"\x04item\x18\x02 \x01(\v2\x12.oteldemo.CartItemR\x04item\"+\n" +
+	"\x10EmptyCartRequest\x12\x17\n" +
+	"\auser_id\x18\x01 \x01(\tR\x06userId\")\n" +
+	"\x0eGetCartRequest\x12\x17\n" +
+	"\auser_id\x18\x01 \x01(\tR\x06userId\"I\n" +
+	"\x04Cart\x12\x17\n" +
+	"\auser_id\x18\x01 \x01(\tR\x06userId\x12(\n" +
+	"\x05items\x18\x02 \x03(\v2\x12.oteldemo.CartItemR\x05items\"\a\n" +
+	"\x05Empty\"V\n" +
+	"\x1aListRecommendationsRequest\x12\x17\n" +
+	"\auser_id\x18\x01 \x01(\tR\x06userId\x12\x1f\n" +
+	"\vproduct_ids\x18\x02 \x03(\tR\n" +
+	"productIds\">\n" +
+	"\x1bListRecommendationsResponse\x12\x1f\n" +
+	"\vproduct_ids\x18\x01 \x03(\tR\n" +
+	"productIds\"\xb7\x01\n" +
+	"\aProduct\x12\x0e\n" +
+	"\x02id\x18\x01 \x01(\tR\x02id\x12\x12\n" +
+	"\x04name\x18\x02 \x01(\tR\x04name\x12 \n" +
+	"\vdescription\x18\x03 \x01(\tR\vdescription\x12\x18\n" +
+	"\apicture\x18\x04 \x01(\tR\apicture\x12,\n" +
+	"\tprice_usd\x18\x05 \x01(\v2\x0f.oteldemo.MoneyR\bpriceUsd\x12\x1e\n" +
+	"\n" +
+	"categories\x18\x06 \x03(\tR\n" +
+	"categories\"E\n" +
+	"\x14ListProductsResponse\x12-\n" +
+	"\bproducts\x18\x01 \x03(\v2\x11.oteldemo.ProductR\bproducts\"#\n" +
+	"\x11GetProductRequest\x12\x0e\n" +
+	"\x02id\x18\x01 \x01(\tR\x02id\"-\n" +
+	"\x15SearchProductsRequest\x12\x14\n" +
+	"\x05query\x18\x01 \x01(\tR\x05query\"E\n" +
+	"\x16SearchProductsResponse\x12+\n" +
+	"\aresults\x18\x01 \x03(\v2\x11.oteldemo.ProductR\aresults\"h\n" +
+	"\x0fGetQuoteRequest\x12+\n" +
+	"\aaddress\x18\x01 \x01(\v2\x11.oteldemo.AddressR\aaddress\x12(\n" +
+	"\x05items\x18\x02 \x03(\v2\x12.oteldemo.CartItemR\x05items\">\n" +
+	"\x10GetQuoteResponse\x12*\n" +
+	"\bcost_usd\x18\x01 \x01(\v2\x0f.oteldemo.MoneyR\acostUsd\"i\n" +
+	"\x10ShipOrderRequest\x12+\n" +
+	"\aaddress\x18\x01 \x01(\v2\x11.oteldemo.AddressR\aaddress\x12(\n" +
+	"\x05items\x18\x02 \x03(\v2\x12.oteldemo.CartItemR\x05items\"4\n" +
+	"\x11ShipOrderResponse\x12\x1f\n" +
+	"\vtracking_id\x18\x01 \x01(\tR\n" +
+	"trackingId\"\x8f\x01\n" +
+	"\aAddress\x12%\n" +
+	"\x0estreet_address\x18\x01 \x01(\tR\rstreetAddress\x12\x12\n" +
+	"\x04city\x18\x02 \x01(\tR\x04city\x12\x14\n" +
+	"\x05state\x18\x03 \x01(\tR\x05state\x12\x18\n" +
+	"\acountry\x18\x04 \x01(\tR\acountry\x12\x19\n" +
+	"\bzip_code\x18\x05 \x01(\tR\azipCode\"X\n" +
+	"\x05Money\x12#\n" +
+	"\rcurrency_code\x18\x01 \x01(\tR\fcurrencyCode\x12\x14\n" +
+	"\x05units\x18\x02 \x01(\x03R\x05units\x12\x14\n" +
+	"\x05nanos\x18\x03 \x01(\x05R\x05nanos\"G\n" +
+	"\x1eGetSupportedCurrenciesResponse\x12%\n" +
+	"\x0ecurrency_codes\x18\x01 \x03(\tR\rcurrencyCodes\"Y\n" +
+	"\x19CurrencyConversionRequest\x12#\n" +
+	"\x04from\x18\x01 \x01(\v2\x0f.oteldemo.MoneyR\x04from\x12\x17\n" +
+	"\ato_code\x18\x02 \x01(\tR\x06toCode\"\xe6\x01\n" +
+	"\x0eCreditCardInfo\x12,\n" +
+	"\x12credit_card_number\x18\x01 \x01(\tR\x10creditCardNumber\x12&\n" +
+	"\x0fcredit_card_cvv\x18\x02 \x01(\x05R\rcreditCardCvv\x12=\n" +
+	"\x1bcredit_card_expiration_year\x18\x03 \x01(\x05R\x18creditCardExpirationYear\x12?\n" +
+	"\x1ccredit_card_expiration_month\x18\x04 \x01(\x05R\x19creditCardExpirationMonth\"s\n" +
+	"\rChargeRequest\x12'\n" +
+	"\x06amount\x18\x01 \x01(\v2\x0f.oteldemo.MoneyR\x06amount\x129\n" +
+	"\vcredit_card\x18\x02 \x01(\v2\x18.oteldemo.CreditCardInfoR\n" +
+	"creditCard\"7\n" +
+	"\x0eChargeResponse\x12%\n" +
+	"\x0etransaction_id\x18\x01 \x01(\tR\rtransactionId\"X\n" +
+	"\tOrderItem\x12&\n" +
+	"\x04item\x18\x01 \x01(\v2\x12.oteldemo.CartItemR\x04item\x12#\n" +
+	"\x04cost\x18\x02 \x01(\v2\x0f.oteldemo.MoneyR\x04cost\"\xf9\x01\n" +
+	"\vOrderResult\x12\x19\n" +
+	"\border_id\x18\x01 \x01(\tR\aorderId\x120\n" +
+	"\x14shipping_tracking_id\x18\x02 \x01(\tR\x12shippingTrackingId\x124\n" +
+	"\rshipping_cost\x18\x03 \x01(\v2\x0f.oteldemo.MoneyR\fshippingCost\x12<\n" +
+	"\x10shipping_address\x18\x04 \x01(\v2\x11.oteldemo.AddressR\x0fshippingAddress\x12)\n" +
+	"\x05items\x18\x05 \x03(\v2\x13.oteldemo.OrderItemR\x05items\"a\n" +
+	"\x1cSendOrderConfirmationRequest\x12\x14\n" +
+	"\x05email\x18\x01 \x01(\tR\x05email\x12+\n" +
+	"\x05order\x18\x02 \x01(\v2\x15.oteldemo.OrderResultR\x05order\"\xcf\x01\n" +
+	"\x11PlaceOrderRequest\x12\x17\n" +
+	"\auser_id\x18\x01 \x01(\tR\x06userId\x12#\n" +
+	"\ruser_currency\x18\x02 \x01(\tR\fuserCurrency\x12+\n" +
+	"\aaddress\x18\x03 \x01(\v2\x11.oteldemo.AddressR\aaddress\x12\x14\n" +
+	"\x05email\x18\x05 \x01(\tR\x05email\x129\n" +
+	"\vcredit_card\x18\x06 \x01(\v2\x18.oteldemo.CreditCardInfoR\n" +
+	"creditCard\"A\n" +
+	"\x12PlaceOrderResponse\x12+\n" +
+	"\x05order\x18\x01 \x01(\v2\x15.oteldemo.OrderResultR\x05order\".\n" +
+	"\tAdRequest\x12!\n" +
+	"\fcontext_keys\x18\x01 \x03(\tR\vcontextKeys\",\n" +
+	"\n" +
+	"AdResponse\x12\x1e\n" +
+	"\x03ads\x18\x01 \x03(\v2\f.oteldemo.AdR\x03ads\";\n" +
+	"\x02Ad\x12!\n" +
+	"\fredirect_url\x18\x01 \x01(\tR\vredirectUrl\x12\x12\n" +
+	"\x04text\x18\x02 \x01(\tR\x04text\"V\n" +
+	"\x04Flag\x12\x12\n" +
+	"\x04name\x18\x01 \x01(\tR\x04name\x12 \n" +
+	"\vdescription\x18\x02 \x01(\tR\vdescription\x12\x18\n" +
+	"\aenabled\x18\x03 \x01(\bR\aenabled\"$\n" +
+	"\x0eGetFlagRequest\x12\x12\n" +
+	"\x04name\x18\x01 \x01(\tR\x04name\"5\n" +
+	"\x0fGetFlagResponse\x12\"\n" +
+	"\x04flag\x18\x01 \x01(\v2\x0e.oteldemo.FlagR\x04flag\"c\n" +
+	"\x11CreateFlagRequest\x12\x12\n" +
+	"\x04name\x18\x01 \x01(\tR\x04name\x12 \n" +
+	"\vdescription\x18\x02 \x01(\tR\vdescription\x12\x18\n" +
+	"\aenabled\x18\x03 \x01(\bR\aenabled\"8\n" +
+	"\x12CreateFlagResponse\x12\"\n" +
+	"\x04flag\x18\x01 \x01(\v2\x0e.oteldemo.FlagR\x04flag\"A\n" +
+	"\x11UpdateFlagRequest\x12\x12\n" +
+	"\x04name\x18\x01 \x01(\tR\x04name\x12\x18\n" +
+	"\aenabled\x18\x02 \x01(\bR\aenabled\"\x14\n" +
+	"\x12UpdateFlagResponse\"\x12\n" +
+	"\x10ListFlagsRequest\"7\n" +
+	"\x11ListFlagsResponse\x12\"\n" +
+	"\x04flag\x18\x01 \x03(\v2\x0e.oteldemo.FlagR\x04flag\"'\n" +
+	"\x11DeleteFlagRequest\x12\x12\n" +
+	"\x04name\x18\x01 \x01(\tR\x04name\"\x14\n" +
+	"\x12DeleteFlagResponse2\xb8\x01\n" +
+	"\vCartService\x126\n" +
+	"\aAddItem\x12\x18.oteldemo.AddItemRequest\x1a\x0f.oteldemo.Empty\"\x00\x125\n" +
+	"\aGetCart\x12\x18.oteldemo.GetCartRequest\x1a\x0e.oteldemo.Cart\"\x00\x12:\n" +
+	"\tEmptyCart\x12\x1a.oteldemo.EmptyCartRequest\x1a\x0f.oteldemo.Empty\"\x002}\n" +
+	"\x15RecommendationService\x12d\n" +
+	"\x13ListRecommendations\x12$.oteldemo.ListRecommendationsRequest\x1a%.oteldemo.ListRecommendationsResponse\"\x002\xf1\x01\n" +
+	"\x15ProductCatalogService\x12A\n" +
+	"\fListProducts\x12\x0f.oteldemo.Empty\x1a\x1e.oteldemo.ListProductsResponse\"\x00\x12>\n" +
+	"\n" +
+	"GetProduct\x12\x1b.oteldemo.GetProductRequest\x1a\x11.oteldemo.Product\"\x00\x12U\n" +
+	"\x0eSearchProducts\x12\x1f.oteldemo.SearchProductsRequest\x1a .oteldemo.SearchProductsResponse\"\x002\x9e\x01\n" +
+	"\x0fShippingService\x12C\n" +
+	"\bGetQuote\x12\x19.oteldemo.GetQuoteRequest\x1a\x1a.oteldemo.GetQuoteResponse\"\x00\x12F\n" +
+	"\tShipOrder\x12\x1a.oteldemo.ShipOrderRequest\x1a\x1b.oteldemo.ShipOrderResponse\"\x002\xab\x01\n" +
+	"\x0fCurrencyService\x12U\n" +
+	"\x16GetSupportedCurrencies\x12\x0f.oteldemo.Empty\x1a(.oteldemo.GetSupportedCurrenciesResponse\"\x00\x12A\n" +
+	"\aConvert\x12#.oteldemo.CurrencyConversionRequest\x1a\x0f.oteldemo.Money\"\x002O\n" +
+	"\x0ePaymentService\x12=\n" +
+	"\x06Charge\x12\x17.oteldemo.ChargeRequest\x1a\x18.oteldemo.ChargeResponse\"\x002b\n" +
+	"\fEmailService\x12R\n" +
+	"\x15SendOrderConfirmation\x12&.oteldemo.SendOrderConfirmationRequest\x1a\x0f.oteldemo.Empty\"\x002\\\n" +
+	"\x0fCheckoutService\x12I\n" +
+	"\n" +
+	"PlaceOrder\x12\x1b.oteldemo.PlaceOrderRequest\x1a\x1c.oteldemo.PlaceOrderResponse\"\x002B\n" +
+	"\tAdService\x125\n" +
+	"\x06GetAds\x12\x13.oteldemo.AdRequest\x1a\x14.oteldemo.AdResponse\"\x002\xff\x02\n" +
+	"\x12FeatureFlagService\x12@\n" +
+	"\aGetFlag\x12\x18.oteldemo.GetFlagRequest\x1a\x19.oteldemo.GetFlagResponse\"\x00\x12I\n" +
+	"\n" +
+	"CreateFlag\x12\x1b.oteldemo.CreateFlagRequest\x1a\x1c.oteldemo.CreateFlagResponse\"\x00\x12I\n" +
+	"\n" +
+	"UpdateFlag\x12\x1b.oteldemo.UpdateFlagRequest\x1a\x1c.oteldemo.UpdateFlagResponse\"\x00\x12F\n" +
+	"\tListFlags\x12\x1a.oteldemo.ListFlagsRequest\x1a\x1b.oteldemo.ListFlagsResponse\"\x00\x12I\n" +
+	"\n" +
+	"DeleteFlag\x12\x1b.oteldemo.DeleteFlagRequest\x1a\x1c.oteldemo.DeleteFlagResponse\"\x00B\x13Z\x11genproto/oteldemob\x06proto3"
+
+var (
+	file_demo_proto_rawDescOnce sync.Once
+	file_demo_proto_rawDescData []byte
+)
+
+func file_demo_proto_rawDescGZIP() []byte {
+	file_demo_proto_rawDescOnce.Do(func() {
+		file_demo_proto_rawDescData = protoimpl.X.CompressGZIP(unsafe.Slice(unsafe.StringData(file_demo_proto_rawDesc), len(file_demo_proto_rawDesc)))
+	})
+	return file_demo_proto_rawDescData
+}
+
+var file_demo_proto_msgTypes = make([]protoimpl.MessageInfo, 43)
+var file_demo_proto_goTypes = []any{
+	(*CartItem)(nil),                       // 0: oteldemo.CartItem
+	(*AddItemRequest)(nil),                 // 1: oteldemo.AddItemRequest
+	(*EmptyCartRequest)(nil),               // 2: oteldemo.EmptyCartRequest
+	(*GetCartRequest)(nil),                 // 3: oteldemo.GetCartRequest
+	(*Cart)(nil),                           // 4: oteldemo.Cart
+	(*Empty)(nil),                          // 5: oteldemo.Empty
+	(*ListRecommendationsRequest)(nil),     // 6: oteldemo.ListRecommendationsRequest
+	(*ListRecommendationsResponse)(nil),    // 7: oteldemo.ListRecommendationsResponse
+	(*Product)(nil),                        // 8: oteldemo.Product
+	(*ListProductsResponse)(nil),           // 9: oteldemo.ListProductsResponse
+	(*GetProductRequest)(nil),              // 10: oteldemo.GetProductRequest
+	(*SearchProductsRequest)(nil),          // 11: oteldemo.SearchProductsRequest
+	(*SearchProductsResponse)(nil),         // 12: oteldemo.SearchProductsResponse
+	(*GetQuoteRequest)(nil),                // 13: oteldemo.GetQuoteRequest
+	(*GetQuoteResponse)(nil),               // 14: oteldemo.GetQuoteResponse
+	(*ShipOrderRequest)(nil),               // 15: oteldemo.ShipOrderRequest
+	(*ShipOrderResponse)(nil),              // 16: oteldemo.ShipOrderResponse
+	(*Address)(nil),                        // 17: oteldemo.Address
+	(*Money)(nil),                          // 18: oteldemo.Money
+	(*GetSupportedCurrenciesResponse)(nil), // 19: oteldemo.GetSupportedCurrenciesResponse
+	(*CurrencyConversionRequest)(nil),      // 20: oteldemo.CurrencyConversionRequest
+	(*CreditCardInfo)(nil),                 // 21: oteldemo.CreditCardInfo
+	(*ChargeRequest)(nil),                  // 22: oteldemo.ChargeRequest
+	(*ChargeResponse)(nil),                 // 23: oteldemo.ChargeResponse
+	(*OrderItem)(nil),                      // 24: oteldemo.OrderItem
+	(*OrderResult)(nil),                    // 25: oteldemo.OrderResult
+	(*SendOrderConfirmationRequest)(nil),   // 26: oteldemo.SendOrderConfirmationRequest
+	(*PlaceOrderRequest)(nil),              // 27: oteldemo.PlaceOrderRequest
+	(*PlaceOrderResponse)(nil),             // 28: oteldemo.PlaceOrderResponse
+	(*AdRequest)(nil),                      // 29: oteldemo.AdRequest
+	(*AdResponse)(nil),                     // 30: oteldemo.AdResponse
+	(*Ad)(nil),                             // 31: oteldemo.Ad
+	(*Flag)(nil),                           // 32: oteldemo.Flag
+	(*GetFlagRequest)(nil),                 // 33: oteldemo.GetFlagRequest
+	(*GetFlagResponse)(nil),                // 34: oteldemo.GetFlagResponse
+	(*CreateFlagRequest)(nil),              // 35: oteldemo.CreateFlagRequest
+	(*CreateFlagResponse)(nil),             // 36: oteldemo.CreateFlagResponse
+	(*UpdateFlagRequest)(nil),              // 37: oteldemo.UpdateFlagRequest
+	(*UpdateFlagResponse)(nil),             // 38: oteldemo.UpdateFlagResponse
+	(*ListFlagsRequest)(nil),               // 39: oteldemo.ListFlagsRequest
+	(*ListFlagsResponse)(nil),              // 40: oteldemo.ListFlagsResponse
+	(*DeleteFlagRequest)(nil),              // 41: oteldemo.DeleteFlagRequest
+	(*DeleteFlagResponse)(nil),             // 42: oteldemo.DeleteFlagResponse
+}
+var file_demo_proto_depIdxs = []int32{
+	0,  // 0: oteldemo.AddItemRequest.item:type_name -> oteldemo.CartItem
+	0,  // 1: oteldemo.Cart.items:type_name -> oteldemo.CartItem
+	18, // 2: oteldemo.Product.price_usd:type_name -> oteldemo.Money
+	8,  // 3: oteldemo.ListProductsResponse.products:type_name -> oteldemo.Product
+	8,  // 4: oteldemo.SearchProductsResponse.results:type_name -> oteldemo.Product
+	17, // 5: oteldemo.GetQuoteRequest.address:type_name -> oteldemo.Address
+	0,  // 6: oteldemo.GetQuoteRequest.items:type_name -> oteldemo.CartItem
+	18, // 7: oteldemo.GetQuoteResponse.cost_usd:type_name -> oteldemo.Money
+	17, // 8: oteldemo.ShipOrderRequest.address:type_name -> oteldemo.Address
+	0,  // 9: oteldemo.ShipOrderRequest.items:type_name -> oteldemo.CartItem
+	18, // 10: oteldemo.CurrencyConversionRequest.from:type_name -> oteldemo.Money
+	18, // 11: oteldemo.ChargeRequest.amount:type_name -> oteldemo.Money
+	21, // 12: oteldemo.ChargeRequest.credit_card:type_name -> oteldemo.CreditCardInfo
+	0,  // 13: oteldemo.OrderItem.item:type_name -> oteldemo.CartItem
+	18, // 14: oteldemo.OrderItem.cost:type_name -> oteldemo.Money
+	18, // 15: oteldemo.OrderResult.shipping_cost:type_name -> oteldemo.Money
+	17, // 16: oteldemo.OrderResult.shipping_address:type_name -> oteldemo.Address
+	24, // 17: oteldemo.OrderResult.items:type_name -> oteldemo.OrderItem
+	25, // 18: oteldemo.SendOrderConfirmationRequest.order:type_name -> oteldemo.OrderResult
+	17, // 19: oteldemo.PlaceOrderRequest.address:type_name -> oteldemo.Address
+	21, // 20: oteldemo.PlaceOrderRequest.credit_card:type_name -> oteldemo.CreditCardInfo
+	25, // 21: oteldemo.PlaceOrderResponse.order:type_name -> oteldemo.OrderResult
+	31, // 22: oteldemo.AdResponse.ads:type_name -> oteldemo.Ad
+	32, // 23: oteldemo.GetFlagResponse.flag:type_name -> oteldemo.Flag
+	32, // 24: oteldemo.CreateFlagResponse.flag:type_name -> oteldemo.Flag
+	32, // 25: oteldemo.ListFlagsResponse.flag:type_name -> oteldemo.Flag
+	1,  // 26: oteldemo.CartService.AddItem:input_type -> oteldemo.AddItemRequest
+	3,  // 27: oteldemo.CartService.GetCart:input_type -> oteldemo.GetCartRequest
+	2,  // 28: oteldemo.CartService.EmptyCart:input_type -> oteldemo.EmptyCartRequest
+	6,  // 29: oteldemo.RecommendationService.ListRecommendations:input_type -> oteldemo.ListRecommendationsRequest
+	5,  // 30: oteldemo.ProductCatalogService.ListProducts:input_type -> oteldemo.Empty
+	10, // 31: oteldemo.ProductCatalogService.GetProduct:input_type -> oteldemo.GetProductRequest
+	11, // 32: oteldemo.ProductCatalogService.SearchProducts:input_type -> oteldemo.SearchProductsRequest
+	13, // 33: oteldemo.ShippingService.GetQuote:input_type -> oteldemo.GetQuoteRequest
+	15, // 34: oteldemo.ShippingService.ShipOrder:input_type -> oteldemo.ShipOrderRequest
+	5,  // 35: oteldemo.CurrencyService.GetSupportedCurrencies:input_type -> oteldemo.Empty
+	20, // 36: oteldemo.CurrencyService.Convert:input_type -> oteldemo.CurrencyConversionRequest
+	22, // 37: oteldemo.PaymentService.Charge:input_type -> oteldemo.ChargeRequest
+	26, // 38: oteldemo.EmailService.SendOrderConfirmation:input_type -> oteldemo.SendOrderConfirmationRequest
+	27, // 39: oteldemo.CheckoutService.PlaceOrder:input_type -> oteldemo.PlaceOrderRequest
+	29, // 40: oteldemo.AdService.GetAds:input_type -> oteldemo.AdRequest
+	33, // 41: oteldemo.FeatureFlagService.GetFlag:input_type -> oteldemo.GetFlagRequest
+	35, // 42: oteldemo.FeatureFlagService.CreateFlag:input_type -> oteldemo.CreateFlagRequest
+	37, // 43: oteldemo.FeatureFlagService.UpdateFlag:input_type -> oteldemo.UpdateFlagRequest
+	39, // 44: oteldemo.FeatureFlagService.ListFlags:input_type -> oteldemo.ListFlagsRequest
+	41, // 45: oteldemo.FeatureFlagService.DeleteFlag:input_type -> oteldemo.DeleteFlagRequest
+	5,  // 46: oteldemo.CartService.AddItem:output_type -> oteldemo.Empty
+	4,  // 47: oteldemo.CartService.GetCart:output_type -> oteldemo.Cart
+	5,  // 48: oteldemo.CartService.EmptyCart:output_type -> oteldemo.Empty
+	7,  // 49: oteldemo.RecommendationService.ListRecommendations:output_type -> oteldemo.ListRecommendationsResponse
+	9,  // 50: oteldemo.ProductCatalogService.ListProducts:output_type -> oteldemo.ListProductsResponse
+	8,  // 51: oteldemo.ProductCatalogService.GetProduct:output_type -> oteldemo.Product
+	12, // 52: oteldemo.ProductCatalogService.SearchProducts:output_type -> oteldemo.SearchProductsResponse
+	14, // 53: oteldemo.ShippingService.GetQuote:output_type -> oteldemo.GetQuoteResponse
+	16, // 54: oteldemo.ShippingService.ShipOrder:output_type -> oteldemo.ShipOrderResponse
+	19, // 55: oteldemo.CurrencyService.GetSupportedCurrencies:output_type -> oteldemo.GetSupportedCurrenciesResponse
+	18, // 56: oteldemo.CurrencyService.Convert:output_type -> oteldemo.Money
+	23, // 57: oteldemo.PaymentService.Charge:output_type -> oteldemo.ChargeResponse
+	5,  // 58: oteldemo.EmailService.SendOrderConfirmation:output_type -> oteldemo.Empty
+	28, // 59: oteldemo.CheckoutService.PlaceOrder:output_type -> oteldemo.PlaceOrderResponse
+	30, // 60: oteldemo.AdService.GetAds:output_type -> oteldemo.AdResponse
+	34, // 61: oteldemo.FeatureFlagService.GetFlag:output_type -> oteldemo.GetFlagResponse
+	36, // 62: oteldemo.FeatureFlagService.CreateFlag:output_type -> oteldemo.CreateFlagResponse
+	38, // 63: oteldemo.FeatureFlagService.UpdateFlag:output_type -> oteldemo.UpdateFlagResponse
+	40, // 64: oteldemo.FeatureFlagService.ListFlags:output_type -> oteldemo.ListFlagsResponse
+	42, // 65: oteldemo.FeatureFlagService.DeleteFlag:output_type -> oteldemo.DeleteFlagResponse
+	46, // [46:66] is the sub-list for method output_type
+	26, // [26:46] is the sub-list for method input_type
+	26, // [26:26] is the sub-list for extension type_name
+	26, // [26:26] is the sub-list for extension extendee
+	0,  // [0:26] is the sub-list for field type_name
+}
+
+func init() { file_demo_proto_init() }
+func file_demo_proto_init() {
+	if File_demo_proto != nil {
+		return
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: unsafe.Slice(unsafe.StringData(file_demo_proto_rawDesc), len(file_demo_proto_rawDesc)),
+			NumEnums:      0,
+			NumMessages:   43,
+			NumExtensions: 0,
+			NumServices:   10,
+		},
+		GoTypes:           file_demo_proto_goTypes,
+		DependencyIndexes: file_demo_proto_depIdxs,
+		MessageInfos:      file_demo_proto_msgTypes,
+	}.Build()
+	File_demo_proto = out.File
+	file_demo_proto_goTypes = nil
+	file_demo_proto_depIdxs = nil
+}
diff --git a/src/checkout/genproto/oteldemo/demo_grpc.pb.go b/src/checkout/genproto/oteldemo/demo_grpc.pb.go
new file mode 100644
index 0000000..f04633a
--- /dev/null
+++ b/src/checkout/genproto/oteldemo/demo_grpc.pb.go
@@ -0,0 +1,1433 @@
+// Copyright 2020 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Code generated by protoc-gen-go-grpc. DO NOT EDIT.
+// versions:
+// - protoc-gen-go-grpc v1.5.1
+// - protoc             v5.29.4
+// source: demo.proto
+
+package oteldemo
+
+import (
+	context "context"
+	grpc "google.golang.org/grpc"
+	codes "google.golang.org/grpc/codes"
+	status "google.golang.org/grpc/status"
+)
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the grpc package it is being compiled against.
+// Requires gRPC-Go v1.64.0 or later.
+const _ = grpc.SupportPackageIsVersion9
+
+const (
+	CartService_AddItem_FullMethodName   = "/oteldemo.CartService/AddItem"
+	CartService_GetCart_FullMethodName   = "/oteldemo.CartService/GetCart"
+	CartService_EmptyCart_FullMethodName = "/oteldemo.CartService/EmptyCart"
+)
+
+// CartServiceClient is the client API for CartService service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
+type CartServiceClient interface {
+	AddItem(ctx context.Context, in *AddItemRequest, opts ...grpc.CallOption) (*Empty, error)
+	GetCart(ctx context.Context, in *GetCartRequest, opts ...grpc.CallOption) (*Cart, error)
+	EmptyCart(ctx context.Context, in *EmptyCartRequest, opts ...grpc.CallOption) (*Empty, error)
+}
+
+type cartServiceClient struct {
+	cc grpc.ClientConnInterface
+}
+
+func NewCartServiceClient(cc grpc.ClientConnInterface) CartServiceClient {
+	return &cartServiceClient{cc}
+}
+
+func (c *cartServiceClient) AddItem(ctx context.Context, in *AddItemRequest, opts ...grpc.CallOption) (*Empty, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(Empty)
+	err := c.cc.Invoke(ctx, CartService_AddItem_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *cartServiceClient) GetCart(ctx context.Context, in *GetCartRequest, opts ...grpc.CallOption) (*Cart, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(Cart)
+	err := c.cc.Invoke(ctx, CartService_GetCart_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *cartServiceClient) EmptyCart(ctx context.Context, in *EmptyCartRequest, opts ...grpc.CallOption) (*Empty, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(Empty)
+	err := c.cc.Invoke(ctx, CartService_EmptyCart_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// CartServiceServer is the server API for CartService service.
+// All implementations must embed UnimplementedCartServiceServer
+// for forward compatibility.
+type CartServiceServer interface {
+	AddItem(context.Context, *AddItemRequest) (*Empty, error)
+	GetCart(context.Context, *GetCartRequest) (*Cart, error)
+	EmptyCart(context.Context, *EmptyCartRequest) (*Empty, error)
+	mustEmbedUnimplementedCartServiceServer()
+}
+
+// UnimplementedCartServiceServer must be embedded to have
+// forward compatible implementations.
+//
+// NOTE: this should be embedded by value instead of pointer to avoid a nil
+// pointer dereference when methods are called.
+type UnimplementedCartServiceServer struct{}
+
+func (UnimplementedCartServiceServer) AddItem(context.Context, *AddItemRequest) (*Empty, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method AddItem not implemented")
+}
+func (UnimplementedCartServiceServer) GetCart(context.Context, *GetCartRequest) (*Cart, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method GetCart not implemented")
+}
+func (UnimplementedCartServiceServer) EmptyCart(context.Context, *EmptyCartRequest) (*Empty, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method EmptyCart not implemented")
+}
+func (UnimplementedCartServiceServer) mustEmbedUnimplementedCartServiceServer() {}
+func (UnimplementedCartServiceServer) testEmbeddedByValue()                     {}
+
+// UnsafeCartServiceServer may be embedded to opt out of forward compatibility for this service.
+// Use of this interface is not recommended, as added methods to CartServiceServer will
+// result in compilation errors.
+type UnsafeCartServiceServer interface {
+	mustEmbedUnimplementedCartServiceServer()
+}
+
+func RegisterCartServiceServer(s grpc.ServiceRegistrar, srv CartServiceServer) {
+	// If the following call pancis, it indicates UnimplementedCartServiceServer was
+	// embedded by pointer and is nil.  This will cause panics if an
+	// unimplemented method is ever invoked, so we test this at initialization
+	// time to prevent it from happening at runtime later due to I/O.
+	if t, ok := srv.(interface{ testEmbeddedByValue() }); ok {
+		t.testEmbeddedByValue()
+	}
+	s.RegisterService(&CartService_ServiceDesc, srv)
+}
+
+func _CartService_AddItem_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(AddItemRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(CartServiceServer).AddItem(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: CartService_AddItem_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(CartServiceServer).AddItem(ctx, req.(*AddItemRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _CartService_GetCart_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(GetCartRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(CartServiceServer).GetCart(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: CartService_GetCart_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(CartServiceServer).GetCart(ctx, req.(*GetCartRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _CartService_EmptyCart_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(EmptyCartRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(CartServiceServer).EmptyCart(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: CartService_EmptyCart_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(CartServiceServer).EmptyCart(ctx, req.(*EmptyCartRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+// CartService_ServiceDesc is the grpc.ServiceDesc for CartService service.
+// It's only intended for direct use with grpc.RegisterService,
+// and not to be introspected or modified (even as a copy)
+var CartService_ServiceDesc = grpc.ServiceDesc{
+	ServiceName: "oteldemo.CartService",
+	HandlerType: (*CartServiceServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "AddItem",
+			Handler:    _CartService_AddItem_Handler,
+		},
+		{
+			MethodName: "GetCart",
+			Handler:    _CartService_GetCart_Handler,
+		},
+		{
+			MethodName: "EmptyCart",
+			Handler:    _CartService_EmptyCart_Handler,
+		},
+	},
+	Streams:  []grpc.StreamDesc{},
+	Metadata: "demo.proto",
+}
+
+const (
+	RecommendationService_ListRecommendations_FullMethodName = "/oteldemo.RecommendationService/ListRecommendations"
+)
+
+// RecommendationServiceClient is the client API for RecommendationService service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
+type RecommendationServiceClient interface {
+	ListRecommendations(ctx context.Context, in *ListRecommendationsRequest, opts ...grpc.CallOption) (*ListRecommendationsResponse, error)
+}
+
+type recommendationServiceClient struct {
+	cc grpc.ClientConnInterface
+}
+
+func NewRecommendationServiceClient(cc grpc.ClientConnInterface) RecommendationServiceClient {
+	return &recommendationServiceClient{cc}
+}
+
+func (c *recommendationServiceClient) ListRecommendations(ctx context.Context, in *ListRecommendationsRequest, opts ...grpc.CallOption) (*ListRecommendationsResponse, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(ListRecommendationsResponse)
+	err := c.cc.Invoke(ctx, RecommendationService_ListRecommendations_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// RecommendationServiceServer is the server API for RecommendationService service.
+// All implementations must embed UnimplementedRecommendationServiceServer
+// for forward compatibility.
+type RecommendationServiceServer interface {
+	ListRecommendations(context.Context, *ListRecommendationsRequest) (*ListRecommendationsResponse, error)
+	mustEmbedUnimplementedRecommendationServiceServer()
+}
+
+// UnimplementedRecommendationServiceServer must be embedded to have
+// forward compatible implementations.
+//
+// NOTE: this should be embedded by value instead of pointer to avoid a nil
+// pointer dereference when methods are called.
+type UnimplementedRecommendationServiceServer struct{}
+
+func (UnimplementedRecommendationServiceServer) ListRecommendations(context.Context, *ListRecommendationsRequest) (*ListRecommendationsResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method ListRecommendations not implemented")
+}
+func (UnimplementedRecommendationServiceServer) mustEmbedUnimplementedRecommendationServiceServer() {}
+func (UnimplementedRecommendationServiceServer) testEmbeddedByValue()                               {}
+
+// UnsafeRecommendationServiceServer may be embedded to opt out of forward compatibility for this service.
+// Use of this interface is not recommended, as added methods to RecommendationServiceServer will
+// result in compilation errors.
+type UnsafeRecommendationServiceServer interface {
+	mustEmbedUnimplementedRecommendationServiceServer()
+}
+
+func RegisterRecommendationServiceServer(s grpc.ServiceRegistrar, srv RecommendationServiceServer) {
+	// If the following call pancis, it indicates UnimplementedRecommendationServiceServer was
+	// embedded by pointer and is nil.  This will cause panics if an
+	// unimplemented method is ever invoked, so we test this at initialization
+	// time to prevent it from happening at runtime later due to I/O.
+	if t, ok := srv.(interface{ testEmbeddedByValue() }); ok {
+		t.testEmbeddedByValue()
+	}
+	s.RegisterService(&RecommendationService_ServiceDesc, srv)
+}
+
+func _RecommendationService_ListRecommendations_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(ListRecommendationsRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(RecommendationServiceServer).ListRecommendations(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: RecommendationService_ListRecommendations_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(RecommendationServiceServer).ListRecommendations(ctx, req.(*ListRecommendationsRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+// RecommendationService_ServiceDesc is the grpc.ServiceDesc for RecommendationService service.
+// It's only intended for direct use with grpc.RegisterService,
+// and not to be introspected or modified (even as a copy)
+var RecommendationService_ServiceDesc = grpc.ServiceDesc{
+	ServiceName: "oteldemo.RecommendationService",
+	HandlerType: (*RecommendationServiceServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "ListRecommendations",
+			Handler:    _RecommendationService_ListRecommendations_Handler,
+		},
+	},
+	Streams:  []grpc.StreamDesc{},
+	Metadata: "demo.proto",
+}
+
+const (
+	ProductCatalogService_ListProducts_FullMethodName   = "/oteldemo.ProductCatalogService/ListProducts"
+	ProductCatalogService_GetProduct_FullMethodName     = "/oteldemo.ProductCatalogService/GetProduct"
+	ProductCatalogService_SearchProducts_FullMethodName = "/oteldemo.ProductCatalogService/SearchProducts"
+)
+
+// ProductCatalogServiceClient is the client API for ProductCatalogService service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
+type ProductCatalogServiceClient interface {
+	ListProducts(ctx context.Context, in *Empty, opts ...grpc.CallOption) (*ListProductsResponse, error)
+	GetProduct(ctx context.Context, in *GetProductRequest, opts ...grpc.CallOption) (*Product, error)
+	SearchProducts(ctx context.Context, in *SearchProductsRequest, opts ...grpc.CallOption) (*SearchProductsResponse, error)
+}
+
+type productCatalogServiceClient struct {
+	cc grpc.ClientConnInterface
+}
+
+func NewProductCatalogServiceClient(cc grpc.ClientConnInterface) ProductCatalogServiceClient {
+	return &productCatalogServiceClient{cc}
+}
+
+func (c *productCatalogServiceClient) ListProducts(ctx context.Context, in *Empty, opts ...grpc.CallOption) (*ListProductsResponse, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(ListProductsResponse)
+	err := c.cc.Invoke(ctx, ProductCatalogService_ListProducts_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *productCatalogServiceClient) GetProduct(ctx context.Context, in *GetProductRequest, opts ...grpc.CallOption) (*Product, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(Product)
+	err := c.cc.Invoke(ctx, ProductCatalogService_GetProduct_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *productCatalogServiceClient) SearchProducts(ctx context.Context, in *SearchProductsRequest, opts ...grpc.CallOption) (*SearchProductsResponse, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(SearchProductsResponse)
+	err := c.cc.Invoke(ctx, ProductCatalogService_SearchProducts_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// ProductCatalogServiceServer is the server API for ProductCatalogService service.
+// All implementations must embed UnimplementedProductCatalogServiceServer
+// for forward compatibility.
+type ProductCatalogServiceServer interface {
+	ListProducts(context.Context, *Empty) (*ListProductsResponse, error)
+	GetProduct(context.Context, *GetProductRequest) (*Product, error)
+	SearchProducts(context.Context, *SearchProductsRequest) (*SearchProductsResponse, error)
+	mustEmbedUnimplementedProductCatalogServiceServer()
+}
+
+// UnimplementedProductCatalogServiceServer must be embedded to have
+// forward compatible implementations.
+//
+// NOTE: this should be embedded by value instead of pointer to avoid a nil
+// pointer dereference when methods are called.
+type UnimplementedProductCatalogServiceServer struct{}
+
+func (UnimplementedProductCatalogServiceServer) ListProducts(context.Context, *Empty) (*ListProductsResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method ListProducts not implemented")
+}
+func (UnimplementedProductCatalogServiceServer) GetProduct(context.Context, *GetProductRequest) (*Product, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method GetProduct not implemented")
+}
+func (UnimplementedProductCatalogServiceServer) SearchProducts(context.Context, *SearchProductsRequest) (*SearchProductsResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method SearchProducts not implemented")
+}
+func (UnimplementedProductCatalogServiceServer) mustEmbedUnimplementedProductCatalogServiceServer() {}
+func (UnimplementedProductCatalogServiceServer) testEmbeddedByValue()                               {}
+
+// UnsafeProductCatalogServiceServer may be embedded to opt out of forward compatibility for this service.
+// Use of this interface is not recommended, as added methods to ProductCatalogServiceServer will
+// result in compilation errors.
+type UnsafeProductCatalogServiceServer interface {
+	mustEmbedUnimplementedProductCatalogServiceServer()
+}
+
+func RegisterProductCatalogServiceServer(s grpc.ServiceRegistrar, srv ProductCatalogServiceServer) {
+	// If the following call pancis, it indicates UnimplementedProductCatalogServiceServer was
+	// embedded by pointer and is nil.  This will cause panics if an
+	// unimplemented method is ever invoked, so we test this at initialization
+	// time to prevent it from happening at runtime later due to I/O.
+	if t, ok := srv.(interface{ testEmbeddedByValue() }); ok {
+		t.testEmbeddedByValue()
+	}
+	s.RegisterService(&ProductCatalogService_ServiceDesc, srv)
+}
+
+func _ProductCatalogService_ListProducts_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(Empty)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(ProductCatalogServiceServer).ListProducts(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: ProductCatalogService_ListProducts_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(ProductCatalogServiceServer).ListProducts(ctx, req.(*Empty))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _ProductCatalogService_GetProduct_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(GetProductRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(ProductCatalogServiceServer).GetProduct(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: ProductCatalogService_GetProduct_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(ProductCatalogServiceServer).GetProduct(ctx, req.(*GetProductRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _ProductCatalogService_SearchProducts_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(SearchProductsRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(ProductCatalogServiceServer).SearchProducts(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: ProductCatalogService_SearchProducts_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(ProductCatalogServiceServer).SearchProducts(ctx, req.(*SearchProductsRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+// ProductCatalogService_ServiceDesc is the grpc.ServiceDesc for ProductCatalogService service.
+// It's only intended for direct use with grpc.RegisterService,
+// and not to be introspected or modified (even as a copy)
+var ProductCatalogService_ServiceDesc = grpc.ServiceDesc{
+	ServiceName: "oteldemo.ProductCatalogService",
+	HandlerType: (*ProductCatalogServiceServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "ListProducts",
+			Handler:    _ProductCatalogService_ListProducts_Handler,
+		},
+		{
+			MethodName: "GetProduct",
+			Handler:    _ProductCatalogService_GetProduct_Handler,
+		},
+		{
+			MethodName: "SearchProducts",
+			Handler:    _ProductCatalogService_SearchProducts_Handler,
+		},
+	},
+	Streams:  []grpc.StreamDesc{},
+	Metadata: "demo.proto",
+}
+
+const (
+	ShippingService_GetQuote_FullMethodName  = "/oteldemo.ShippingService/GetQuote"
+	ShippingService_ShipOrder_FullMethodName = "/oteldemo.ShippingService/ShipOrder"
+)
+
+// ShippingServiceClient is the client API for ShippingService service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
+type ShippingServiceClient interface {
+	GetQuote(ctx context.Context, in *GetQuoteRequest, opts ...grpc.CallOption) (*GetQuoteResponse, error)
+	ShipOrder(ctx context.Context, in *ShipOrderRequest, opts ...grpc.CallOption) (*ShipOrderResponse, error)
+}
+
+type shippingServiceClient struct {
+	cc grpc.ClientConnInterface
+}
+
+func NewShippingServiceClient(cc grpc.ClientConnInterface) ShippingServiceClient {
+	return &shippingServiceClient{cc}
+}
+
+func (c *shippingServiceClient) GetQuote(ctx context.Context, in *GetQuoteRequest, opts ...grpc.CallOption) (*GetQuoteResponse, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(GetQuoteResponse)
+	err := c.cc.Invoke(ctx, ShippingService_GetQuote_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *shippingServiceClient) ShipOrder(ctx context.Context, in *ShipOrderRequest, opts ...grpc.CallOption) (*ShipOrderResponse, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(ShipOrderResponse)
+	err := c.cc.Invoke(ctx, ShippingService_ShipOrder_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// ShippingServiceServer is the server API for ShippingService service.
+// All implementations must embed UnimplementedShippingServiceServer
+// for forward compatibility.
+type ShippingServiceServer interface {
+	GetQuote(context.Context, *GetQuoteRequest) (*GetQuoteResponse, error)
+	ShipOrder(context.Context, *ShipOrderRequest) (*ShipOrderResponse, error)
+	mustEmbedUnimplementedShippingServiceServer()
+}
+
+// UnimplementedShippingServiceServer must be embedded to have
+// forward compatible implementations.
+//
+// NOTE: this should be embedded by value instead of pointer to avoid a nil
+// pointer dereference when methods are called.
+type UnimplementedShippingServiceServer struct{}
+
+func (UnimplementedShippingServiceServer) GetQuote(context.Context, *GetQuoteRequest) (*GetQuoteResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method GetQuote not implemented")
+}
+func (UnimplementedShippingServiceServer) ShipOrder(context.Context, *ShipOrderRequest) (*ShipOrderResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method ShipOrder not implemented")
+}
+func (UnimplementedShippingServiceServer) mustEmbedUnimplementedShippingServiceServer() {}
+func (UnimplementedShippingServiceServer) testEmbeddedByValue()                         {}
+
+// UnsafeShippingServiceServer may be embedded to opt out of forward compatibility for this service.
+// Use of this interface is not recommended, as added methods to ShippingServiceServer will
+// result in compilation errors.
+type UnsafeShippingServiceServer interface {
+	mustEmbedUnimplementedShippingServiceServer()
+}
+
+func RegisterShippingServiceServer(s grpc.ServiceRegistrar, srv ShippingServiceServer) {
+	// If the following call pancis, it indicates UnimplementedShippingServiceServer was
+	// embedded by pointer and is nil.  This will cause panics if an
+	// unimplemented method is ever invoked, so we test this at initialization
+	// time to prevent it from happening at runtime later due to I/O.
+	if t, ok := srv.(interface{ testEmbeddedByValue() }); ok {
+		t.testEmbeddedByValue()
+	}
+	s.RegisterService(&ShippingService_ServiceDesc, srv)
+}
+
+func _ShippingService_GetQuote_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(GetQuoteRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(ShippingServiceServer).GetQuote(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: ShippingService_GetQuote_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(ShippingServiceServer).GetQuote(ctx, req.(*GetQuoteRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _ShippingService_ShipOrder_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(ShipOrderRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(ShippingServiceServer).ShipOrder(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: ShippingService_ShipOrder_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(ShippingServiceServer).ShipOrder(ctx, req.(*ShipOrderRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+// ShippingService_ServiceDesc is the grpc.ServiceDesc for ShippingService service.
+// It's only intended for direct use with grpc.RegisterService,
+// and not to be introspected or modified (even as a copy)
+var ShippingService_ServiceDesc = grpc.ServiceDesc{
+	ServiceName: "oteldemo.ShippingService",
+	HandlerType: (*ShippingServiceServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "GetQuote",
+			Handler:    _ShippingService_GetQuote_Handler,
+		},
+		{
+			MethodName: "ShipOrder",
+			Handler:    _ShippingService_ShipOrder_Handler,
+		},
+	},
+	Streams:  []grpc.StreamDesc{},
+	Metadata: "demo.proto",
+}
+
+const (
+	CurrencyService_GetSupportedCurrencies_FullMethodName = "/oteldemo.CurrencyService/GetSupportedCurrencies"
+	CurrencyService_Convert_FullMethodName                = "/oteldemo.CurrencyService/Convert"
+)
+
+// CurrencyServiceClient is the client API for CurrencyService service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
+type CurrencyServiceClient interface {
+	GetSupportedCurrencies(ctx context.Context, in *Empty, opts ...grpc.CallOption) (*GetSupportedCurrenciesResponse, error)
+	Convert(ctx context.Context, in *CurrencyConversionRequest, opts ...grpc.CallOption) (*Money, error)
+}
+
+type currencyServiceClient struct {
+	cc grpc.ClientConnInterface
+}
+
+func NewCurrencyServiceClient(cc grpc.ClientConnInterface) CurrencyServiceClient {
+	return &currencyServiceClient{cc}
+}
+
+func (c *currencyServiceClient) GetSupportedCurrencies(ctx context.Context, in *Empty, opts ...grpc.CallOption) (*GetSupportedCurrenciesResponse, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(GetSupportedCurrenciesResponse)
+	err := c.cc.Invoke(ctx, CurrencyService_GetSupportedCurrencies_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *currencyServiceClient) Convert(ctx context.Context, in *CurrencyConversionRequest, opts ...grpc.CallOption) (*Money, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(Money)
+	err := c.cc.Invoke(ctx, CurrencyService_Convert_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// CurrencyServiceServer is the server API for CurrencyService service.
+// All implementations must embed UnimplementedCurrencyServiceServer
+// for forward compatibility.
+type CurrencyServiceServer interface {
+	GetSupportedCurrencies(context.Context, *Empty) (*GetSupportedCurrenciesResponse, error)
+	Convert(context.Context, *CurrencyConversionRequest) (*Money, error)
+	mustEmbedUnimplementedCurrencyServiceServer()
+}
+
+// UnimplementedCurrencyServiceServer must be embedded to have
+// forward compatible implementations.
+//
+// NOTE: this should be embedded by value instead of pointer to avoid a nil
+// pointer dereference when methods are called.
+type UnimplementedCurrencyServiceServer struct{}
+
+func (UnimplementedCurrencyServiceServer) GetSupportedCurrencies(context.Context, *Empty) (*GetSupportedCurrenciesResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method GetSupportedCurrencies not implemented")
+}
+func (UnimplementedCurrencyServiceServer) Convert(context.Context, *CurrencyConversionRequest) (*Money, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method Convert not implemented")
+}
+func (UnimplementedCurrencyServiceServer) mustEmbedUnimplementedCurrencyServiceServer() {}
+func (UnimplementedCurrencyServiceServer) testEmbeddedByValue()                         {}
+
+// UnsafeCurrencyServiceServer may be embedded to opt out of forward compatibility for this service.
+// Use of this interface is not recommended, as added methods to CurrencyServiceServer will
+// result in compilation errors.
+type UnsafeCurrencyServiceServer interface {
+	mustEmbedUnimplementedCurrencyServiceServer()
+}
+
+func RegisterCurrencyServiceServer(s grpc.ServiceRegistrar, srv CurrencyServiceServer) {
+	// If the following call pancis, it indicates UnimplementedCurrencyServiceServer was
+	// embedded by pointer and is nil.  This will cause panics if an
+	// unimplemented method is ever invoked, so we test this at initialization
+	// time to prevent it from happening at runtime later due to I/O.
+	if t, ok := srv.(interface{ testEmbeddedByValue() }); ok {
+		t.testEmbeddedByValue()
+	}
+	s.RegisterService(&CurrencyService_ServiceDesc, srv)
+}
+
+func _CurrencyService_GetSupportedCurrencies_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(Empty)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(CurrencyServiceServer).GetSupportedCurrencies(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: CurrencyService_GetSupportedCurrencies_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(CurrencyServiceServer).GetSupportedCurrencies(ctx, req.(*Empty))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _CurrencyService_Convert_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(CurrencyConversionRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(CurrencyServiceServer).Convert(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: CurrencyService_Convert_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(CurrencyServiceServer).Convert(ctx, req.(*CurrencyConversionRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+// CurrencyService_ServiceDesc is the grpc.ServiceDesc for CurrencyService service.
+// It's only intended for direct use with grpc.RegisterService,
+// and not to be introspected or modified (even as a copy)
+var CurrencyService_ServiceDesc = grpc.ServiceDesc{
+	ServiceName: "oteldemo.CurrencyService",
+	HandlerType: (*CurrencyServiceServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "GetSupportedCurrencies",
+			Handler:    _CurrencyService_GetSupportedCurrencies_Handler,
+		},
+		{
+			MethodName: "Convert",
+			Handler:    _CurrencyService_Convert_Handler,
+		},
+	},
+	Streams:  []grpc.StreamDesc{},
+	Metadata: "demo.proto",
+}
+
+const (
+	PaymentService_Charge_FullMethodName = "/oteldemo.PaymentService/Charge"
+)
+
+// PaymentServiceClient is the client API for PaymentService service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
+type PaymentServiceClient interface {
+	Charge(ctx context.Context, in *ChargeRequest, opts ...grpc.CallOption) (*ChargeResponse, error)
+}
+
+type paymentServiceClient struct {
+	cc grpc.ClientConnInterface
+}
+
+func NewPaymentServiceClient(cc grpc.ClientConnInterface) PaymentServiceClient {
+	return &paymentServiceClient{cc}
+}
+
+func (c *paymentServiceClient) Charge(ctx context.Context, in *ChargeRequest, opts ...grpc.CallOption) (*ChargeResponse, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(ChargeResponse)
+	err := c.cc.Invoke(ctx, PaymentService_Charge_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// PaymentServiceServer is the server API for PaymentService service.
+// All implementations must embed UnimplementedPaymentServiceServer
+// for forward compatibility.
+type PaymentServiceServer interface {
+	Charge(context.Context, *ChargeRequest) (*ChargeResponse, error)
+	mustEmbedUnimplementedPaymentServiceServer()
+}
+
+// UnimplementedPaymentServiceServer must be embedded to have
+// forward compatible implementations.
+//
+// NOTE: this should be embedded by value instead of pointer to avoid a nil
+// pointer dereference when methods are called.
+type UnimplementedPaymentServiceServer struct{}
+
+func (UnimplementedPaymentServiceServer) Charge(context.Context, *ChargeRequest) (*ChargeResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method Charge not implemented")
+}
+func (UnimplementedPaymentServiceServer) mustEmbedUnimplementedPaymentServiceServer() {}
+func (UnimplementedPaymentServiceServer) testEmbeddedByValue()                        {}
+
+// UnsafePaymentServiceServer may be embedded to opt out of forward compatibility for this service.
+// Use of this interface is not recommended, as added methods to PaymentServiceServer will
+// result in compilation errors.
+type UnsafePaymentServiceServer interface {
+	mustEmbedUnimplementedPaymentServiceServer()
+}
+
+func RegisterPaymentServiceServer(s grpc.ServiceRegistrar, srv PaymentServiceServer) {
+	// If the following call pancis, it indicates UnimplementedPaymentServiceServer was
+	// embedded by pointer and is nil.  This will cause panics if an
+	// unimplemented method is ever invoked, so we test this at initialization
+	// time to prevent it from happening at runtime later due to I/O.
+	if t, ok := srv.(interface{ testEmbeddedByValue() }); ok {
+		t.testEmbeddedByValue()
+	}
+	s.RegisterService(&PaymentService_ServiceDesc, srv)
+}
+
+func _PaymentService_Charge_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(ChargeRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(PaymentServiceServer).Charge(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: PaymentService_Charge_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(PaymentServiceServer).Charge(ctx, req.(*ChargeRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+// PaymentService_ServiceDesc is the grpc.ServiceDesc for PaymentService service.
+// It's only intended for direct use with grpc.RegisterService,
+// and not to be introspected or modified (even as a copy)
+var PaymentService_ServiceDesc = grpc.ServiceDesc{
+	ServiceName: "oteldemo.PaymentService",
+	HandlerType: (*PaymentServiceServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "Charge",
+			Handler:    _PaymentService_Charge_Handler,
+		},
+	},
+	Streams:  []grpc.StreamDesc{},
+	Metadata: "demo.proto",
+}
+
+const (
+	EmailService_SendOrderConfirmation_FullMethodName = "/oteldemo.EmailService/SendOrderConfirmation"
+)
+
+// EmailServiceClient is the client API for EmailService service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
+type EmailServiceClient interface {
+	SendOrderConfirmation(ctx context.Context, in *SendOrderConfirmationRequest, opts ...grpc.CallOption) (*Empty, error)
+}
+
+type emailServiceClient struct {
+	cc grpc.ClientConnInterface
+}
+
+func NewEmailServiceClient(cc grpc.ClientConnInterface) EmailServiceClient {
+	return &emailServiceClient{cc}
+}
+
+func (c *emailServiceClient) SendOrderConfirmation(ctx context.Context, in *SendOrderConfirmationRequest, opts ...grpc.CallOption) (*Empty, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(Empty)
+	err := c.cc.Invoke(ctx, EmailService_SendOrderConfirmation_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// EmailServiceServer is the server API for EmailService service.
+// All implementations must embed UnimplementedEmailServiceServer
+// for forward compatibility.
+type EmailServiceServer interface {
+	SendOrderConfirmation(context.Context, *SendOrderConfirmationRequest) (*Empty, error)
+	mustEmbedUnimplementedEmailServiceServer()
+}
+
+// UnimplementedEmailServiceServer must be embedded to have
+// forward compatible implementations.
+//
+// NOTE: this should be embedded by value instead of pointer to avoid a nil
+// pointer dereference when methods are called.
+type UnimplementedEmailServiceServer struct{}
+
+func (UnimplementedEmailServiceServer) SendOrderConfirmation(context.Context, *SendOrderConfirmationRequest) (*Empty, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method SendOrderConfirmation not implemented")
+}
+func (UnimplementedEmailServiceServer) mustEmbedUnimplementedEmailServiceServer() {}
+func (UnimplementedEmailServiceServer) testEmbeddedByValue()                      {}
+
+// UnsafeEmailServiceServer may be embedded to opt out of forward compatibility for this service.
+// Use of this interface is not recommended, as added methods to EmailServiceServer will
+// result in compilation errors.
+type UnsafeEmailServiceServer interface {
+	mustEmbedUnimplementedEmailServiceServer()
+}
+
+func RegisterEmailServiceServer(s grpc.ServiceRegistrar, srv EmailServiceServer) {
+	// If the following call pancis, it indicates UnimplementedEmailServiceServer was
+	// embedded by pointer and is nil.  This will cause panics if an
+	// unimplemented method is ever invoked, so we test this at initialization
+	// time to prevent it from happening at runtime later due to I/O.
+	if t, ok := srv.(interface{ testEmbeddedByValue() }); ok {
+		t.testEmbeddedByValue()
+	}
+	s.RegisterService(&EmailService_ServiceDesc, srv)
+}
+
+func _EmailService_SendOrderConfirmation_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(SendOrderConfirmationRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(EmailServiceServer).SendOrderConfirmation(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: EmailService_SendOrderConfirmation_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(EmailServiceServer).SendOrderConfirmation(ctx, req.(*SendOrderConfirmationRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+// EmailService_ServiceDesc is the grpc.ServiceDesc for EmailService service.
+// It's only intended for direct use with grpc.RegisterService,
+// and not to be introspected or modified (even as a copy)
+var EmailService_ServiceDesc = grpc.ServiceDesc{
+	ServiceName: "oteldemo.EmailService",
+	HandlerType: (*EmailServiceServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "SendOrderConfirmation",
+			Handler:    _EmailService_SendOrderConfirmation_Handler,
+		},
+	},
+	Streams:  []grpc.StreamDesc{},
+	Metadata: "demo.proto",
+}
+
+const (
+	CheckoutService_PlaceOrder_FullMethodName = "/oteldemo.CheckoutService/PlaceOrder"
+)
+
+// CheckoutServiceClient is the client API for CheckoutService service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
+type CheckoutServiceClient interface {
+	PlaceOrder(ctx context.Context, in *PlaceOrderRequest, opts ...grpc.CallOption) (*PlaceOrderResponse, error)
+}
+
+type checkoutServiceClient struct {
+	cc grpc.ClientConnInterface
+}
+
+func NewCheckoutServiceClient(cc grpc.ClientConnInterface) CheckoutServiceClient {
+	return &checkoutServiceClient{cc}
+}
+
+func (c *checkoutServiceClient) PlaceOrder(ctx context.Context, in *PlaceOrderRequest, opts ...grpc.CallOption) (*PlaceOrderResponse, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(PlaceOrderResponse)
+	err := c.cc.Invoke(ctx, CheckoutService_PlaceOrder_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// CheckoutServiceServer is the server API for CheckoutService service.
+// All implementations must embed UnimplementedCheckoutServiceServer
+// for forward compatibility.
+type CheckoutServiceServer interface {
+	PlaceOrder(context.Context, *PlaceOrderRequest) (*PlaceOrderResponse, error)
+	mustEmbedUnimplementedCheckoutServiceServer()
+}
+
+// UnimplementedCheckoutServiceServer must be embedded to have
+// forward compatible implementations.
+//
+// NOTE: this should be embedded by value instead of pointer to avoid a nil
+// pointer dereference when methods are called.
+type UnimplementedCheckoutServiceServer struct{}
+
+func (UnimplementedCheckoutServiceServer) PlaceOrder(context.Context, *PlaceOrderRequest) (*PlaceOrderResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method PlaceOrder not implemented")
+}
+func (UnimplementedCheckoutServiceServer) mustEmbedUnimplementedCheckoutServiceServer() {}
+func (UnimplementedCheckoutServiceServer) testEmbeddedByValue()                         {}
+
+// UnsafeCheckoutServiceServer may be embedded to opt out of forward compatibility for this service.
+// Use of this interface is not recommended, as added methods to CheckoutServiceServer will
+// result in compilation errors.
+type UnsafeCheckoutServiceServer interface {
+	mustEmbedUnimplementedCheckoutServiceServer()
+}
+
+func RegisterCheckoutServiceServer(s grpc.ServiceRegistrar, srv CheckoutServiceServer) {
+	// If the following call pancis, it indicates UnimplementedCheckoutServiceServer was
+	// embedded by pointer and is nil.  This will cause panics if an
+	// unimplemented method is ever invoked, so we test this at initialization
+	// time to prevent it from happening at runtime later due to I/O.
+	if t, ok := srv.(interface{ testEmbeddedByValue() }); ok {
+		t.testEmbeddedByValue()
+	}
+	s.RegisterService(&CheckoutService_ServiceDesc, srv)
+}
+
+func _CheckoutService_PlaceOrder_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(PlaceOrderRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(CheckoutServiceServer).PlaceOrder(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: CheckoutService_PlaceOrder_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(CheckoutServiceServer).PlaceOrder(ctx, req.(*PlaceOrderRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+// CheckoutService_ServiceDesc is the grpc.ServiceDesc for CheckoutService service.
+// It's only intended for direct use with grpc.RegisterService,
+// and not to be introspected or modified (even as a copy)
+var CheckoutService_ServiceDesc = grpc.ServiceDesc{
+	ServiceName: "oteldemo.CheckoutService",
+	HandlerType: (*CheckoutServiceServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "PlaceOrder",
+			Handler:    _CheckoutService_PlaceOrder_Handler,
+		},
+	},
+	Streams:  []grpc.StreamDesc{},
+	Metadata: "demo.proto",
+}
+
+const (
+	AdService_GetAds_FullMethodName = "/oteldemo.AdService/GetAds"
+)
+
+// AdServiceClient is the client API for AdService service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
+type AdServiceClient interface {
+	GetAds(ctx context.Context, in *AdRequest, opts ...grpc.CallOption) (*AdResponse, error)
+}
+
+type adServiceClient struct {
+	cc grpc.ClientConnInterface
+}
+
+func NewAdServiceClient(cc grpc.ClientConnInterface) AdServiceClient {
+	return &adServiceClient{cc}
+}
+
+func (c *adServiceClient) GetAds(ctx context.Context, in *AdRequest, opts ...grpc.CallOption) (*AdResponse, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(AdResponse)
+	err := c.cc.Invoke(ctx, AdService_GetAds_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// AdServiceServer is the server API for AdService service.
+// All implementations must embed UnimplementedAdServiceServer
+// for forward compatibility.
+type AdServiceServer interface {
+	GetAds(context.Context, *AdRequest) (*AdResponse, error)
+	mustEmbedUnimplementedAdServiceServer()
+}
+
+// UnimplementedAdServiceServer must be embedded to have
+// forward compatible implementations.
+//
+// NOTE: this should be embedded by value instead of pointer to avoid a nil
+// pointer dereference when methods are called.
+type UnimplementedAdServiceServer struct{}
+
+func (UnimplementedAdServiceServer) GetAds(context.Context, *AdRequest) (*AdResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method GetAds not implemented")
+}
+func (UnimplementedAdServiceServer) mustEmbedUnimplementedAdServiceServer() {}
+func (UnimplementedAdServiceServer) testEmbeddedByValue()                   {}
+
+// UnsafeAdServiceServer may be embedded to opt out of forward compatibility for this service.
+// Use of this interface is not recommended, as added methods to AdServiceServer will
+// result in compilation errors.
+type UnsafeAdServiceServer interface {
+	mustEmbedUnimplementedAdServiceServer()
+}
+
+func RegisterAdServiceServer(s grpc.ServiceRegistrar, srv AdServiceServer) {
+	// If the following call pancis, it indicates UnimplementedAdServiceServer was
+	// embedded by pointer and is nil.  This will cause panics if an
+	// unimplemented method is ever invoked, so we test this at initialization
+	// time to prevent it from happening at runtime later due to I/O.
+	if t, ok := srv.(interface{ testEmbeddedByValue() }); ok {
+		t.testEmbeddedByValue()
+	}
+	s.RegisterService(&AdService_ServiceDesc, srv)
+}
+
+func _AdService_GetAds_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(AdRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(AdServiceServer).GetAds(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: AdService_GetAds_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(AdServiceServer).GetAds(ctx, req.(*AdRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+// AdService_ServiceDesc is the grpc.ServiceDesc for AdService service.
+// It's only intended for direct use with grpc.RegisterService,
+// and not to be introspected or modified (even as a copy)
+var AdService_ServiceDesc = grpc.ServiceDesc{
+	ServiceName: "oteldemo.AdService",
+	HandlerType: (*AdServiceServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "GetAds",
+			Handler:    _AdService_GetAds_Handler,
+		},
+	},
+	Streams:  []grpc.StreamDesc{},
+	Metadata: "demo.proto",
+}
+
+const (
+	FeatureFlagService_GetFlag_FullMethodName    = "/oteldemo.FeatureFlagService/GetFlag"
+	FeatureFlagService_CreateFlag_FullMethodName = "/oteldemo.FeatureFlagService/CreateFlag"
+	FeatureFlagService_UpdateFlag_FullMethodName = "/oteldemo.FeatureFlagService/UpdateFlag"
+	FeatureFlagService_ListFlags_FullMethodName  = "/oteldemo.FeatureFlagService/ListFlags"
+	FeatureFlagService_DeleteFlag_FullMethodName = "/oteldemo.FeatureFlagService/DeleteFlag"
+)
+
+// FeatureFlagServiceClient is the client API for FeatureFlagService service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
+type FeatureFlagServiceClient interface {
+	GetFlag(ctx context.Context, in *GetFlagRequest, opts ...grpc.CallOption) (*GetFlagResponse, error)
+	CreateFlag(ctx context.Context, in *CreateFlagRequest, opts ...grpc.CallOption) (*CreateFlagResponse, error)
+	UpdateFlag(ctx context.Context, in *UpdateFlagRequest, opts ...grpc.CallOption) (*UpdateFlagResponse, error)
+	ListFlags(ctx context.Context, in *ListFlagsRequest, opts ...grpc.CallOption) (*ListFlagsResponse, error)
+	DeleteFlag(ctx context.Context, in *DeleteFlagRequest, opts ...grpc.CallOption) (*DeleteFlagResponse, error)
+}
+
+type featureFlagServiceClient struct {
+	cc grpc.ClientConnInterface
+}
+
+func NewFeatureFlagServiceClient(cc grpc.ClientConnInterface) FeatureFlagServiceClient {
+	return &featureFlagServiceClient{cc}
+}
+
+func (c *featureFlagServiceClient) GetFlag(ctx context.Context, in *GetFlagRequest, opts ...grpc.CallOption) (*GetFlagResponse, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(GetFlagResponse)
+	err := c.cc.Invoke(ctx, FeatureFlagService_GetFlag_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *featureFlagServiceClient) CreateFlag(ctx context.Context, in *CreateFlagRequest, opts ...grpc.CallOption) (*CreateFlagResponse, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(CreateFlagResponse)
+	err := c.cc.Invoke(ctx, FeatureFlagService_CreateFlag_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *featureFlagServiceClient) UpdateFlag(ctx context.Context, in *UpdateFlagRequest, opts ...grpc.CallOption) (*UpdateFlagResponse, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(UpdateFlagResponse)
+	err := c.cc.Invoke(ctx, FeatureFlagService_UpdateFlag_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *featureFlagServiceClient) ListFlags(ctx context.Context, in *ListFlagsRequest, opts ...grpc.CallOption) (*ListFlagsResponse, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(ListFlagsResponse)
+	err := c.cc.Invoke(ctx, FeatureFlagService_ListFlags_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *featureFlagServiceClient) DeleteFlag(ctx context.Context, in *DeleteFlagRequest, opts ...grpc.CallOption) (*DeleteFlagResponse, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(DeleteFlagResponse)
+	err := c.cc.Invoke(ctx, FeatureFlagService_DeleteFlag_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// FeatureFlagServiceServer is the server API for FeatureFlagService service.
+// All implementations must embed UnimplementedFeatureFlagServiceServer
+// for forward compatibility.
+type FeatureFlagServiceServer interface {
+	GetFlag(context.Context, *GetFlagRequest) (*GetFlagResponse, error)
+	CreateFlag(context.Context, *CreateFlagRequest) (*CreateFlagResponse, error)
+	UpdateFlag(context.Context, *UpdateFlagRequest) (*UpdateFlagResponse, error)
+	ListFlags(context.Context, *ListFlagsRequest) (*ListFlagsResponse, error)
+	DeleteFlag(context.Context, *DeleteFlagRequest) (*DeleteFlagResponse, error)
+	mustEmbedUnimplementedFeatureFlagServiceServer()
+}
+
+// UnimplementedFeatureFlagServiceServer must be embedded to have
+// forward compatible implementations.
+//
+// NOTE: this should be embedded by value instead of pointer to avoid a nil
+// pointer dereference when methods are called.
+type UnimplementedFeatureFlagServiceServer struct{}
+
+func (UnimplementedFeatureFlagServiceServer) GetFlag(context.Context, *GetFlagRequest) (*GetFlagResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method GetFlag not implemented")
+}
+func (UnimplementedFeatureFlagServiceServer) CreateFlag(context.Context, *CreateFlagRequest) (*CreateFlagResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method CreateFlag not implemented")
+}
+func (UnimplementedFeatureFlagServiceServer) UpdateFlag(context.Context, *UpdateFlagRequest) (*UpdateFlagResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method UpdateFlag not implemented")
+}
+func (UnimplementedFeatureFlagServiceServer) ListFlags(context.Context, *ListFlagsRequest) (*ListFlagsResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method ListFlags not implemented")
+}
+func (UnimplementedFeatureFlagServiceServer) DeleteFlag(context.Context, *DeleteFlagRequest) (*DeleteFlagResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method DeleteFlag not implemented")
+}
+func (UnimplementedFeatureFlagServiceServer) mustEmbedUnimplementedFeatureFlagServiceServer() {}
+func (UnimplementedFeatureFlagServiceServer) testEmbeddedByValue()                            {}
+
+// UnsafeFeatureFlagServiceServer may be embedded to opt out of forward compatibility for this service.
+// Use of this interface is not recommended, as added methods to FeatureFlagServiceServer will
+// result in compilation errors.
+type UnsafeFeatureFlagServiceServer interface {
+	mustEmbedUnimplementedFeatureFlagServiceServer()
+}
+
+func RegisterFeatureFlagServiceServer(s grpc.ServiceRegistrar, srv FeatureFlagServiceServer) {
+	// If the following call pancis, it indicates UnimplementedFeatureFlagServiceServer was
+	// embedded by pointer and is nil.  This will cause panics if an
+	// unimplemented method is ever invoked, so we test this at initialization
+	// time to prevent it from happening at runtime later due to I/O.
+	if t, ok := srv.(interface{ testEmbeddedByValue() }); ok {
+		t.testEmbeddedByValue()
+	}
+	s.RegisterService(&FeatureFlagService_ServiceDesc, srv)
+}
+
+func _FeatureFlagService_GetFlag_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(GetFlagRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(FeatureFlagServiceServer).GetFlag(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: FeatureFlagService_GetFlag_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(FeatureFlagServiceServer).GetFlag(ctx, req.(*GetFlagRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _FeatureFlagService_CreateFlag_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(CreateFlagRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(FeatureFlagServiceServer).CreateFlag(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: FeatureFlagService_CreateFlag_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(FeatureFlagServiceServer).CreateFlag(ctx, req.(*CreateFlagRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _FeatureFlagService_UpdateFlag_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(UpdateFlagRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(FeatureFlagServiceServer).UpdateFlag(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: FeatureFlagService_UpdateFlag_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(FeatureFlagServiceServer).UpdateFlag(ctx, req.(*UpdateFlagRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _FeatureFlagService_ListFlags_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(ListFlagsRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(FeatureFlagServiceServer).ListFlags(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: FeatureFlagService_ListFlags_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(FeatureFlagServiceServer).ListFlags(ctx, req.(*ListFlagsRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _FeatureFlagService_DeleteFlag_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(DeleteFlagRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(FeatureFlagServiceServer).DeleteFlag(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: FeatureFlagService_DeleteFlag_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(FeatureFlagServiceServer).DeleteFlag(ctx, req.(*DeleteFlagRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+// FeatureFlagService_ServiceDesc is the grpc.ServiceDesc for FeatureFlagService service.
+// It's only intended for direct use with grpc.RegisterService,
+// and not to be introspected or modified (even as a copy)
+var FeatureFlagService_ServiceDesc = grpc.ServiceDesc{
+	ServiceName: "oteldemo.FeatureFlagService",
+	HandlerType: (*FeatureFlagServiceServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "GetFlag",
+			Handler:    _FeatureFlagService_GetFlag_Handler,
+		},
+		{
+			MethodName: "CreateFlag",
+			Handler:    _FeatureFlagService_CreateFlag_Handler,
+		},
+		{
+			MethodName: "UpdateFlag",
+			Handler:    _FeatureFlagService_UpdateFlag_Handler,
+		},
+		{
+			MethodName: "ListFlags",
+			Handler:    _FeatureFlagService_ListFlags_Handler,
+		},
+		{
+			MethodName: "DeleteFlag",
+			Handler:    _FeatureFlagService_DeleteFlag_Handler,
+		},
+	},
+	Streams:  []grpc.StreamDesc{},
+	Metadata: "demo.proto",
+}
diff --git a/src/checkout/go.mod b/src/checkout/go.mod
new file mode 100644
index 0000000..7f0d505
--- /dev/null
+++ b/src/checkout/go.mod
@@ -0,0 +1,87 @@
+module github.com/open-telemetry/opentelemetry-demo/src/checkout
+
+go 1.24.2
+
+require (
+	github.com/IBM/sarama v1.46.1
+	github.com/google/uuid v1.6.0
+	github.com/open-feature/go-sdk v1.15.1
+	github.com/open-feature/go-sdk-contrib/hooks/open-telemetry v0.3.6
+	github.com/open-feature/go-sdk-contrib/providers/flagd v0.3.0
+	go.opentelemetry.io/contrib/bridges/otelslog v0.13.0
+	go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.63.0
+	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.63.0
+	go.opentelemetry.io/contrib/instrumentation/runtime v0.63.0
+	go.opentelemetry.io/otel v1.38.0
+	go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc v0.14.0
+	go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc v1.38.0
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.38.0
+	go.opentelemetry.io/otel/log v0.14.0
+	go.opentelemetry.io/otel/sdk v1.38.0
+	go.opentelemetry.io/otel/sdk/log v0.14.0
+	go.opentelemetry.io/otel/sdk/metric v1.38.0
+	go.opentelemetry.io/otel/trace v1.38.0
+	google.golang.org/grpc v1.75.1
+	google.golang.org/protobuf v1.36.9
+)
+
+require (
+	buf.build/gen/go/open-feature/flagd/connectrpc/go v1.18.1-20250127221518-be6d1143b690.1 // indirect
+	buf.build/gen/go/open-feature/flagd/grpc/go v1.5.1-20250127221518-be6d1143b690.2 // indirect
+	buf.build/gen/go/open-feature/flagd/protocolbuffers/go v1.36.6-20250127221518-be6d1143b690.1 // indirect
+	connectrpc.com/connect v1.18.1 // indirect
+	connectrpc.com/otelconnect v0.7.2 // indirect
+	github.com/barkimedes/go-deepcopy v0.0.0-20220514131651-17c30cfc62df // indirect
+	github.com/cenkalti/backoff/v5 v5.0.3 // indirect
+	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
+	github.com/diegoholiveira/jsonlogic/v3 v3.7.4 // indirect
+	github.com/eapache/go-resiliency v1.7.0 // indirect
+	github.com/eapache/go-xerial-snappy v0.0.0-20230731223053-c322873962e3 // indirect
+	github.com/eapache/queue v1.1.0 // indirect
+	github.com/felixge/httpsnoop v1.0.4 // indirect
+	github.com/fsnotify/fsnotify v1.8.0 // indirect
+	github.com/go-logr/logr v1.4.3 // indirect
+	github.com/go-logr/stdr v1.2.2 // indirect
+	github.com/golang/snappy v0.0.4 // indirect
+	github.com/grpc-ecosystem/grpc-gateway/v2 v2.27.2 // indirect
+	github.com/hashicorp/go-uuid v1.0.3 // indirect
+	github.com/hashicorp/golang-lru/v2 v2.0.7 // indirect
+	github.com/jcmturner/aescts/v2 v2.0.0 // indirect
+	github.com/jcmturner/dnsutils/v2 v2.0.0 // indirect
+	github.com/jcmturner/gofork v1.7.6 // indirect
+	github.com/jcmturner/gokrb5/v8 v8.4.4 // indirect
+	github.com/jcmturner/rpc/v2 v2.0.3 // indirect
+	github.com/klauspost/compress v1.18.0 // indirect
+	github.com/klauspost/cpuid/v2 v2.2.7 // indirect
+	github.com/open-feature/flagd-schemas v0.2.9-0.20250127221449-bb763438abc5 // indirect
+	github.com/open-feature/flagd/core v0.11.2 // indirect
+	github.com/pierrec/lz4/v4 v4.1.22 // indirect
+	github.com/rcrowley/go-metrics v0.0.0-20250401214520-65e299d6c5c9 // indirect
+	github.com/twmb/murmur3 v1.1.8 // indirect
+	github.com/xeipuuv/gojsonpointer v0.0.0-20190905194746-02993c407bfb // indirect
+	github.com/xeipuuv/gojsonreference v0.0.0-20180127040603-bd5ef7bd5415 // indirect
+	github.com/xeipuuv/gojsonschema v1.2.0 // indirect
+	github.com/zeebo/xxh3 v1.0.2 // indirect
+	go.opentelemetry.io/auto/sdk v1.1.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.38.0 // indirect
+	go.opentelemetry.io/otel/metric v1.38.0 // indirect
+	go.opentelemetry.io/proto/otlp v1.7.1 // indirect
+	go.uber.org/mock v0.5.2 // indirect
+	go.uber.org/multierr v1.11.0 // indirect
+	go.uber.org/zap v1.27.0 // indirect
+	golang.org/x/crypto v0.42.0 // indirect
+	golang.org/x/exp v0.0.0-20250408133849-7e4ce0ab07d0 // indirect
+	golang.org/x/mod v0.27.0 // indirect
+	golang.org/x/net v0.44.0 // indirect
+	golang.org/x/sys v0.36.0 // indirect
+	golang.org/x/text v0.29.0 // indirect
+	google.golang.org/genproto/googleapis/api v0.0.0-20250825161204-c5933d9347a5 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20250825161204-c5933d9347a5 // indirect
+	google.golang.org/grpc/cmd/protoc-gen-go-grpc v1.5.1 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)
+
+tool (
+	google.golang.org/grpc/cmd/protoc-gen-go-grpc
+	google.golang.org/protobuf/cmd/protoc-gen-go
+)
diff --git a/src/checkout/go.sum b/src/checkout/go.sum
new file mode 100644
index 0000000..fe48a39
--- /dev/null
+++ b/src/checkout/go.sum
@@ -0,0 +1,225 @@
+buf.build/gen/go/open-feature/flagd/connectrpc/go v1.18.1-20250127221518-be6d1143b690.1 h1:BIA4nkcwwyl0zPZ4vutd5Mn+VeLOV756RmvbQbfnb9g=
+buf.build/gen/go/open-feature/flagd/connectrpc/go v1.18.1-20250127221518-be6d1143b690.1/go.mod h1:BSerK2QrH0wQdgiFP6fKevMB4QXotvyXUfmE6mExwHY=
+buf.build/gen/go/open-feature/flagd/grpc/go v1.5.1-20250127221518-be6d1143b690.2 h1:D3HI5RQbqgffyf+Z77+hReDx5kigFVAKGvttULD9/ms=
+buf.build/gen/go/open-feature/flagd/grpc/go v1.5.1-20250127221518-be6d1143b690.2/go.mod h1:b9rfG6rbGXZAlLwQwedvZ0kI0nUcR+aLaYF70pj920E=
+buf.build/gen/go/open-feature/flagd/protocolbuffers/go v1.36.6-20250127221518-be6d1143b690.1 h1:vxTpPJylwPBezTghhBEHOsdptq8+tb/PtSkGw3rhPQc=
+buf.build/gen/go/open-feature/flagd/protocolbuffers/go v1.36.6-20250127221518-be6d1143b690.1/go.mod h1:cCQ49+ttXE2MZ/ciRNb0tCG+F3kj2ZVbP+0/psbhrLY=
+connectrpc.com/connect v1.18.1 h1:PAg7CjSAGvscaf6YZKUefjoih5Z/qYkyaTrBW8xvYPw=
+connectrpc.com/connect v1.18.1/go.mod h1:0292hj1rnx8oFrStN7cB4jjVBeqs+Yx5yDIC2prWDO8=
+connectrpc.com/otelconnect v0.7.2 h1:WlnwFzaW64dN06JXU+hREPUGeEzpz3Acz2ACOmN8cMI=
+connectrpc.com/otelconnect v0.7.2/go.mod h1:JS7XUKfuJs2adhCnXhNHPHLz6oAaZniCJdSF00OZSew=
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diff --git a/src/checkout/kafka/producer.go b/src/checkout/kafka/producer.go
new file mode 100644
index 0000000..3bd9cc6
--- /dev/null
+++ b/src/checkout/kafka/producer.go
@@ -0,0 +1,61 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+package kafka
+
+import (
+	"fmt"
+	"log/slog"
+
+	"github.com/IBM/sarama"
+)
+
+var (
+	Topic           = "orders"
+	ProtocolVersion = sarama.V3_0_0_0
+)
+
+type saramaLogger struct {
+	logger *slog.Logger
+}
+
+func (l *saramaLogger) Printf(format string, v ...interface{}) {
+	l.logger.Info(fmt.Sprintf(format, v...))
+}
+func (l *saramaLogger) Println(v ...interface{}) {
+	l.logger.Info(fmt.Sprint(v...))
+}
+func (l *saramaLogger) Print(v ...interface{}) {
+	l.logger.Info(fmt.Sprint(v...))
+}
+
+func CreateKafkaProducer(brokers []string, logger *slog.Logger) (sarama.AsyncProducer, error) {
+	// Set the logger for sarama to use.
+	sarama.Logger = &saramaLogger{logger: logger}
+
+	saramaConfig := sarama.NewConfig()
+	saramaConfig.Producer.Return.Successes = true
+	saramaConfig.Producer.Return.Errors = true
+
+	// Sarama has an issue in a single broker kafka if the kafka broker is restarted.
+	// This setting is to prevent that issue from manifesting itself, but may swallow failed messages.
+	saramaConfig.Producer.RequiredAcks = sarama.NoResponse
+
+	saramaConfig.Version = ProtocolVersion
+
+	// So we can know the partition and offset of messages.
+	saramaConfig.Producer.Return.Successes = true
+
+	producer, err := sarama.NewAsyncProducer(brokers, saramaConfig)
+	if err != nil {
+		return nil, err
+	}
+
+	// We will log to STDOUT if we're not able to produce messages.
+	go func() {
+		for err := range producer.Errors() {
+			logger.Error(fmt.Sprintf("Failed to write message: %+v", err))
+
+		}
+	}()
+	return producer, nil
+}
diff --git a/src/checkout/main.go b/src/checkout/main.go
new file mode 100644
index 0000000..f200865
--- /dev/null
+++ b/src/checkout/main.go
@@ -0,0 +1,729 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+package main
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"log/slog"
+	"net"
+	"net/http"
+	"os"
+	"os/signal"
+	"strconv"
+	"sync"
+	"syscall"
+	"time"
+
+	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/log/global"
+	semconv "go.opentelemetry.io/otel/semconv/v1.24.0"
+	"go.opentelemetry.io/otel/trace"
+
+	"github.com/IBM/sarama"
+	"github.com/google/uuid"
+	otelhooks "github.com/open-feature/go-sdk-contrib/hooks/open-telemetry/pkg"
+	flagd "github.com/open-feature/go-sdk-contrib/providers/flagd/pkg"
+	"github.com/open-feature/go-sdk/openfeature"
+
+	"go.opentelemetry.io/contrib/bridges/otelslog"
+	"go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc"
+	"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
+	"go.opentelemetry.io/contrib/instrumentation/runtime"
+	"go.opentelemetry.io/otel"
+	otelcodes "go.opentelemetry.io/otel/codes"
+	"go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc"
+	"go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc"
+	"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
+	"go.opentelemetry.io/otel/propagation"
+
+	sdklog "go.opentelemetry.io/otel/sdk/log"
+	sdkmetric "go.opentelemetry.io/otel/sdk/metric"
+	sdkresource "go.opentelemetry.io/otel/sdk/resource"
+	sdktrace "go.opentelemetry.io/otel/sdk/trace"
+
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/credentials/insecure"
+	"google.golang.org/grpc/health"
+	healthpb "google.golang.org/grpc/health/grpc_health_v1"
+	"google.golang.org/grpc/status"
+	"google.golang.org/protobuf/proto"
+
+	pb "github.com/open-telemetry/opentelemetry-demo/src/checkout/genproto/oteldemo"
+	"github.com/open-telemetry/opentelemetry-demo/src/checkout/kafka"
+	"github.com/open-telemetry/opentelemetry-demo/src/checkout/money"
+)
+
+//go:generate go install google.golang.org/protobuf/cmd/protoc-gen-go
+//go:generate go install google.golang.org/grpc/cmd/protoc-gen-go-grpc
+//go:generate protoc --go_out=./ --go-grpc_out=./ --proto_path=../../pb ../../pb/demo.proto
+
+var logger *slog.Logger
+var tracer trace.Tracer
+var resource *sdkresource.Resource
+var initResourcesOnce sync.Once
+
+func initResource() *sdkresource.Resource {
+	initResourcesOnce.Do(func() {
+		extraResources, _ := sdkresource.New(
+			context.Background(),
+			sdkresource.WithOS(),
+			sdkresource.WithProcess(),
+			sdkresource.WithContainer(),
+			sdkresource.WithHost(),
+		)
+		resource, _ = sdkresource.Merge(
+			sdkresource.Default(),
+			extraResources,
+		)
+	})
+	return resource
+}
+
+func initTracerProvider() *sdktrace.TracerProvider {
+	ctx := context.Background()
+
+	exporter, err := otlptracegrpc.New(ctx)
+	if err != nil {
+		logger.Error(fmt.Sprintf("new otlp trace grpc exporter failed: %v", err))
+	}
+	tp := sdktrace.NewTracerProvider(
+		sdktrace.WithBatcher(exporter),
+		sdktrace.WithResource(initResource()),
+	)
+	otel.SetTracerProvider(tp)
+	otel.SetTextMapPropagator(propagation.NewCompositeTextMapPropagator(propagation.TraceContext{}, propagation.Baggage{}))
+	return tp
+}
+
+func initMeterProvider() *sdkmetric.MeterProvider {
+	ctx := context.Background()
+
+	exporter, err := otlpmetricgrpc.New(ctx)
+	if err != nil {
+		logger.Error(fmt.Sprintf("new otlp metric grpc exporter failed: %v", err))
+	}
+
+	mp := sdkmetric.NewMeterProvider(
+		sdkmetric.WithReader(sdkmetric.NewPeriodicReader(exporter)),
+		sdkmetric.WithResource(initResource()),
+	)
+	otel.SetMeterProvider(mp)
+	return mp
+}
+
+func initLoggerProvider() *sdklog.LoggerProvider {
+	ctx := context.Background()
+
+	logExporter, err := otlploggrpc.New(ctx)
+	if err != nil {
+		return nil
+	}
+
+	loggerProvider := sdklog.NewLoggerProvider(
+		sdklog.WithProcessor(sdklog.NewBatchProcessor(logExporter)),
+	)
+	global.SetLoggerProvider(loggerProvider)
+
+	return loggerProvider
+}
+
+type checkout struct {
+	productCatalogSvcAddr string
+	cartSvcAddr           string
+	currencySvcAddr       string
+	shippingSvcAddr       string
+	emailSvcAddr          string
+	paymentSvcAddr        string
+	kafkaBrokerSvcAddr    string
+	pb.UnimplementedCheckoutServiceServer
+	KafkaProducerClient     sarama.AsyncProducer
+	shippingSvcClient       pb.ShippingServiceClient
+	productCatalogSvcClient pb.ProductCatalogServiceClient
+	cartSvcClient           pb.CartServiceClient
+	currencySvcClient       pb.CurrencyServiceClient
+	emailSvcClient          pb.EmailServiceClient
+	paymentSvcClient        pb.PaymentServiceClient
+}
+
+func main() {
+	var port string
+	mustMapEnv(&port, "CHECKOUT_PORT")
+
+	tp := initTracerProvider()
+	defer func() {
+		if err := tp.Shutdown(context.Background()); err != nil {
+			logger.Error(fmt.Sprintf("Error shutting down tracer provider: %v", err))
+		}
+	}()
+
+	mp := initMeterProvider()
+	defer func() {
+		if err := mp.Shutdown(context.Background()); err != nil {
+			logger.Error(fmt.Sprintf("Error shutting down meter provider: %v", err))
+		}
+	}()
+
+	lp := initLoggerProvider()
+	defer func() {
+		if err := lp.Shutdown(context.Background()); err != nil {
+			logger.Error(fmt.Sprintf("Error shutting down logger provider: %v", err))
+		}
+	}()
+
+	// this *must* be called after the logger provider is initialized
+	// otherwise the Sarama producer in kafka/producer.go will not be
+	// able to log properly
+	logger = otelslog.NewLogger("checkout")
+	slog.SetDefault(logger)
+
+	err := runtime.Start(runtime.WithMinimumReadMemStatsInterval(time.Second))
+	if err != nil {
+		logger.Error((err.Error()))
+	}
+
+	provider, err := flagd.NewProvider()
+	if err != nil {
+		logger.Error(fmt.Sprintf("Error creating flagd provider: %v", err))
+	}
+
+	openfeature.SetProvider(provider)
+	openfeature.AddHooks(otelhooks.NewTracesHook())
+
+	tracer = tp.Tracer("checkout")
+
+	svc := new(checkout)
+
+	mustMapEnv(&svc.shippingSvcAddr, "SHIPPING_ADDR")
+	c := mustCreateClient(svc.shippingSvcAddr)
+	svc.shippingSvcClient = pb.NewShippingServiceClient(c)
+	defer c.Close()
+
+	mustMapEnv(&svc.productCatalogSvcAddr, "PRODUCT_CATALOG_ADDR")
+	c = mustCreateClient(svc.productCatalogSvcAddr)
+	svc.productCatalogSvcClient = pb.NewProductCatalogServiceClient(c)
+	defer c.Close()
+
+	mustMapEnv(&svc.cartSvcAddr, "CART_ADDR")
+	c = mustCreateClient(svc.cartSvcAddr)
+	svc.cartSvcClient = pb.NewCartServiceClient(c)
+	defer c.Close()
+
+	mustMapEnv(&svc.currencySvcAddr, "CURRENCY_ADDR")
+	c = mustCreateClient(svc.currencySvcAddr)
+	svc.currencySvcClient = pb.NewCurrencyServiceClient(c)
+	defer c.Close()
+
+	mustMapEnv(&svc.emailSvcAddr, "EMAIL_ADDR")
+	c = mustCreateClient(svc.emailSvcAddr)
+	svc.emailSvcClient = pb.NewEmailServiceClient(c)
+	defer c.Close()
+
+	mustMapEnv(&svc.paymentSvcAddr, "PAYMENT_ADDR")
+	c = mustCreateClient(svc.paymentSvcAddr)
+	svc.paymentSvcClient = pb.NewPaymentServiceClient(c)
+	defer c.Close()
+
+	svc.kafkaBrokerSvcAddr = os.Getenv("KAFKA_ADDR")
+
+	if svc.kafkaBrokerSvcAddr != "" {
+		svc.KafkaProducerClient, err = kafka.CreateKafkaProducer([]string{svc.kafkaBrokerSvcAddr}, logger)
+		if err != nil {
+			logger.Error(err.Error())
+		}
+	}
+
+	logger.Info(fmt.Sprintf("service config: %+v", svc))
+
+	lis, err := net.Listen("tcp", fmt.Sprintf(":%s", port))
+	if err != nil {
+		logger.Error(err.Error())
+	}
+
+	var srv = grpc.NewServer(
+		grpc.StatsHandler(otelgrpc.NewServerHandler()),
+	)
+	pb.RegisterCheckoutServiceServer(srv, svc)
+
+	healthcheck := health.NewServer()
+	healthpb.RegisterHealthServer(srv, healthcheck)
+	logger.Info(fmt.Sprintf("starting to listen on tcp: %q", lis.Addr().String()))
+	err = srv.Serve(lis)
+	logger.Error(err.Error())
+
+	ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM, syscall.SIGKILL)
+	defer cancel()
+
+	go func() {
+		if err := srv.Serve(lis); err != nil {
+			logger.Error(err.Error())
+		}
+	}()
+
+	<-ctx.Done()
+
+	srv.GracefulStop()
+	logger.Info("Checkout gRPC server stopped")
+}
+
+func mustMapEnv(target *string, envKey string) {
+	v := os.Getenv(envKey)
+	if v == "" {
+		panic(fmt.Sprintf("environment variable %q not set", envKey))
+	}
+	*target = v
+}
+
+func (cs *checkout) Check(ctx context.Context, req *healthpb.HealthCheckRequest) (*healthpb.HealthCheckResponse, error) {
+	return &healthpb.HealthCheckResponse{Status: healthpb.HealthCheckResponse_SERVING}, nil
+}
+
+func (cs *checkout) Watch(req *healthpb.HealthCheckRequest, ws healthpb.Health_WatchServer) error {
+	return status.Errorf(codes.Unimplemented, "health check via Watch not implemented")
+}
+
+func (cs *checkout) PlaceOrder(ctx context.Context, req *pb.PlaceOrderRequest) (*pb.PlaceOrderResponse, error) {
+	span := trace.SpanFromContext(ctx)
+	span.SetAttributes(
+		attribute.String("app.user.id", req.UserId),
+		attribute.String("app.user.currency", req.UserCurrency),
+	)
+	logger.LogAttrs(
+		ctx,
+		slog.LevelInfo, "[PlaceOrder]",
+		slog.String("user_id", req.UserId),
+		slog.String("user_currency", req.UserCurrency),
+	)
+
+	var err error
+	defer func() {
+		if err != nil {
+			span.AddEvent("error", trace.WithAttributes(semconv.ExceptionMessageKey.String(err.Error())))
+		}
+	}()
+
+	orderID, err := uuid.NewUUID()
+	if err != nil {
+		return nil, status.Errorf(codes.Internal, "failed to generate order uuid")
+	}
+
+	prep, err := cs.prepareOrderItemsAndShippingQuoteFromCart(ctx, req.UserId, req.UserCurrency, req.Address)
+	if err != nil {
+		return nil, status.Errorf(codes.Internal, err.Error())
+	}
+	span.AddEvent("prepared")
+
+	total := &pb.Money{CurrencyCode: req.UserCurrency,
+		Units: 0,
+		Nanos: 0}
+	total = money.Must(money.Sum(total, prep.shippingCostLocalized))
+	for _, it := range prep.orderItems {
+		multPrice := money.MultiplySlow(it.Cost, uint32(it.GetItem().GetQuantity()))
+		total = money.Must(money.Sum(total, multPrice))
+	}
+
+	txID, err := cs.chargeCard(ctx, total, req.CreditCard)
+	if err != nil {
+		return nil, status.Errorf(codes.Internal, "failed to charge card: %+v", err)
+	}
+
+	span.AddEvent("charged",
+		trace.WithAttributes(attribute.String("app.payment.transaction.id", txID)))
+	logger.LogAttrs(
+		ctx,
+		slog.LevelInfo, "payment went through",
+		slog.String("transaction_id", txID),
+	)
+
+	shippingTrackingID, err := cs.shipOrder(ctx, req.Address, prep.cartItems)
+	if err != nil {
+		return nil, status.Errorf(codes.Unavailable, "shipping error: %+v", err)
+	}
+	shippingTrackingAttribute := attribute.String("app.shipping.tracking.id", shippingTrackingID)
+	span.AddEvent("shipped", trace.WithAttributes(shippingTrackingAttribute))
+
+	_ = cs.emptyUserCart(ctx, req.UserId)
+
+	orderResult := &pb.OrderResult{
+		OrderId:            orderID.String(),
+		ShippingTrackingId: shippingTrackingID,
+		ShippingCost:       prep.shippingCostLocalized,
+		ShippingAddress:    req.Address,
+		Items:              prep.orderItems,
+	}
+
+	shippingCostFloat, _ := strconv.ParseFloat(fmt.Sprintf("%d.%02d", prep.shippingCostLocalized.GetUnits(), prep.shippingCostLocalized.GetNanos()/1000000000), 64)
+	totalPriceFloat, _ := strconv.ParseFloat(fmt.Sprintf("%d.%02d", total.GetUnits(), total.GetNanos()/1000000000), 64)
+
+	span.SetAttributes(
+		attribute.String("app.order.id", orderID.String()),
+		attribute.Float64("app.shipping.amount", shippingCostFloat),
+		attribute.Float64("app.order.amount", totalPriceFloat),
+		attribute.Int("app.order.items.count", len(prep.orderItems)),
+		shippingTrackingAttribute,
+	)
+	logger.LogAttrs(
+		ctx,
+		slog.LevelInfo, "order placed",
+		slog.String("app.order.id", orderID.String()),
+		slog.Float64("app.shipping.amount", shippingCostFloat),
+		slog.Float64("app.order.amount", totalPriceFloat),
+		slog.Int("app.order.items.count", len(prep.orderItems)),
+		slog.String("app.shipping.tracking.id", shippingTrackingID),
+	)
+
+	if err := cs.sendOrderConfirmation(ctx, req.Email, orderResult); err != nil {
+		logger.Warn(fmt.Sprintf("failed to send order confirmation to %q: %+v", req.Email, err))
+	} else {
+		logger.Info(fmt.Sprintf("order confirmation email sent to %q", req.Email))
+	}
+
+	// send to kafka only if kafka broker address is set
+	if cs.kafkaBrokerSvcAddr != "" {
+		logger.Info("sending to postProcessor")
+		cs.sendToPostProcessor(ctx, orderResult)
+	}
+
+	resp := &pb.PlaceOrderResponse{Order: orderResult}
+	return resp, nil
+}
+
+type orderPrep struct {
+	orderItems            []*pb.OrderItem
+	cartItems             []*pb.CartItem
+	shippingCostLocalized *pb.Money
+}
+
+func (cs *checkout) prepareOrderItemsAndShippingQuoteFromCart(ctx context.Context, userID, userCurrency string, address *pb.Address) (orderPrep, error) {
+
+	ctx, span := tracer.Start(ctx, "prepareOrderItemsAndShippingQuoteFromCart")
+	defer span.End()
+
+	var out orderPrep
+	cartItems, err := cs.getUserCart(ctx, userID)
+	if err != nil {
+		return out, fmt.Errorf("cart failure: %+v", err)
+	}
+	orderItems, err := cs.prepOrderItems(ctx, cartItems, userCurrency)
+	if err != nil {
+		return out, fmt.Errorf("failed to prepare order: %+v", err)
+	}
+	shippingUSD, err := cs.quoteShipping(ctx, address, cartItems)
+	if err != nil {
+		return out, fmt.Errorf("shipping quote failure: %+v", err)
+	}
+	shippingPrice, err := cs.convertCurrency(ctx, shippingUSD, userCurrency)
+	if err != nil {
+		return out, fmt.Errorf("failed to convert shipping cost to currency: %+v", err)
+	}
+
+	out.shippingCostLocalized = shippingPrice
+	out.cartItems = cartItems
+	out.orderItems = orderItems
+
+	var totalCart int32
+	for _, ci := range cartItems {
+		totalCart += ci.Quantity
+	}
+	shippingCostFloat, _ := strconv.ParseFloat(fmt.Sprintf("%d.%02d", shippingPrice.GetUnits(), shippingPrice.GetNanos()/1000000000), 64)
+
+	span.SetAttributes(
+		attribute.Float64("app.shipping.amount", shippingCostFloat),
+		attribute.Int("app.cart.items.count", int(totalCart)),
+		attribute.Int("app.order.items.count", len(orderItems)),
+	)
+	return out, nil
+}
+
+func mustCreateClient(svcAddr string) *grpc.ClientConn {
+	c, err := grpc.NewClient(svcAddr,
+		grpc.WithTransportCredentials(insecure.NewCredentials()),
+		grpc.WithStatsHandler(otelgrpc.NewClientHandler()),
+	)
+	if err != nil {
+		logger.Error(fmt.Sprintf("could not connect to %s service, err: %+v", svcAddr, err))
+	}
+
+	return c
+}
+
+func (cs *checkout) quoteShipping(ctx context.Context, address *pb.Address, items []*pb.CartItem) (*pb.Money, error) {
+	quotePayload, err := json.Marshal(map[string]interface{}{
+		"address": address,
+		"items":   items,
+	})
+	if err != nil {
+		return nil, fmt.Errorf("failed to marshal ship order request: %+v", err)
+	}
+
+	resp, err := otelhttp.Post(ctx, cs.shippingSvcAddr+"/get-quote", "application/json", bytes.NewBuffer(quotePayload))
+	if err != nil {
+		return nil, fmt.Errorf("failed POST to shipping service: %+v", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("failed POST to email service: expected 200, got %d", resp.StatusCode)
+	}
+
+	shippingQuoteBytes, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read shipping quote response: %+v", err)
+	}
+
+	var quoteResp struct {
+		CostUsd *pb.Money `json:"cost_usd"`
+	}
+	if err := json.Unmarshal(shippingQuoteBytes, &quoteResp); err != nil {
+		return nil, fmt.Errorf("failed to unmarshal shipping quote: %+v", err)
+	}
+	if quoteResp.CostUsd == nil {
+		return nil, fmt.Errorf("shipping quote missing cost_usd field")
+	}
+
+	return quoteResp.CostUsd, nil
+}
+
+func (cs *checkout) getUserCart(ctx context.Context, userID string) ([]*pb.CartItem, error) {
+	cart, err := cs.cartSvcClient.GetCart(ctx, &pb.GetCartRequest{UserId: userID})
+	if err != nil {
+		return nil, fmt.Errorf("failed to get user cart during checkout: %+v", err)
+	}
+	return cart.GetItems(), nil
+}
+
+func (cs *checkout) emptyUserCart(ctx context.Context, userID string) error {
+	if _, err := cs.cartSvcClient.EmptyCart(ctx, &pb.EmptyCartRequest{UserId: userID}); err != nil {
+		return fmt.Errorf("failed to empty user cart during checkout: %+v", err)
+	}
+	return nil
+}
+
+func (cs *checkout) prepOrderItems(ctx context.Context, items []*pb.CartItem, userCurrency string) ([]*pb.OrderItem, error) {
+	out := make([]*pb.OrderItem, len(items))
+
+	for i, item := range items {
+		product, err := cs.productCatalogSvcClient.GetProduct(ctx, &pb.GetProductRequest{Id: item.GetProductId()})
+		if err != nil {
+			return nil, fmt.Errorf("failed to get product #%q", item.GetProductId())
+		}
+		price, err := cs.convertCurrency(ctx, product.GetPriceUsd(), userCurrency)
+		if err != nil {
+			return nil, fmt.Errorf("failed to convert price of %q to %s", item.GetProductId(), userCurrency)
+		}
+		out[i] = &pb.OrderItem{
+			Item: item,
+			Cost: price}
+	}
+	return out, nil
+}
+
+func (cs *checkout) convertCurrency(ctx context.Context, from *pb.Money, toCurrency string) (*pb.Money, error) {
+	result, err := cs.currencySvcClient.Convert(ctx, &pb.CurrencyConversionRequest{
+		From:   from,
+		ToCode: toCurrency})
+	if err != nil {
+		return nil, fmt.Errorf("failed to convert currency: %+v", err)
+	}
+	return result, err
+}
+
+func (cs *checkout) chargeCard(ctx context.Context, amount *pb.Money, paymentInfo *pb.CreditCardInfo) (string, error) {
+	paymentService := cs.paymentSvcClient
+	if cs.isFeatureFlagEnabled(ctx, "paymentUnreachable") {
+		badAddress := "badAddress:50051"
+		c := mustCreateClient(badAddress)
+		paymentService = pb.NewPaymentServiceClient(c)
+	}
+
+	paymentResp, err := paymentService.Charge(ctx, &pb.ChargeRequest{
+		Amount:     amount,
+		CreditCard: paymentInfo})
+	if err != nil {
+		return "", fmt.Errorf("could not charge the card: %+v", err)
+	}
+	return paymentResp.GetTransactionId(), nil
+}
+
+func (cs *checkout) sendOrderConfirmation(ctx context.Context, email string, order *pb.OrderResult) error {
+	emailPayload, err := json.Marshal(map[string]interface{}{
+		"email": email,
+		"order": order,
+	})
+	if err != nil {
+		return fmt.Errorf("failed to marshal order to JSON: %+v", err)
+	}
+
+	resp, err := otelhttp.Post(ctx, cs.emailSvcAddr+"/send_order_confirmation", "application/json", bytes.NewBuffer(emailPayload))
+	if err != nil {
+		return fmt.Errorf("failed POST to email service: %+v", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return fmt.Errorf("failed POST to email service: expected 200, got %d", resp.StatusCode)
+	}
+
+	return err
+}
+
+func (cs *checkout) shipOrder(ctx context.Context, address *pb.Address, items []*pb.CartItem) (string, error) {
+	shipPayload, err := json.Marshal(map[string]interface{}{
+		"address": address,
+		"items":   items,
+	})
+	if err != nil {
+		return "", fmt.Errorf("failed to marshal ship order request: %+v", err)
+	}
+
+	resp, err := otelhttp.Post(ctx, cs.shippingSvcAddr+"/ship-order", "application/json", bytes.NewBuffer(shipPayload))
+	if err != nil {
+		return "", fmt.Errorf("failed POST to shipping service: %+v", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return "", fmt.Errorf("failed POST to email service: expected 200, got %d", resp.StatusCode)
+	}
+
+	trackingRespBytes, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return "", fmt.Errorf("failed to read ship order response: %+v", err)
+	}
+
+	var shipResp struct {
+		TrackingID string `json:"tracking_id"`
+	}
+	if err := json.Unmarshal(trackingRespBytes, &shipResp); err != nil {
+		return "", fmt.Errorf("failed to unmarshal ship order response: %+v", err)
+	}
+	if shipResp.TrackingID == "" {
+		return "", fmt.Errorf("ship order response missing tracking_id field")
+	}
+
+	return shipResp.TrackingID, nil
+}
+
+func (cs *checkout) sendToPostProcessor(ctx context.Context, result *pb.OrderResult) {
+	message, err := proto.Marshal(result)
+	if err != nil {
+		logger.Error(fmt.Sprintf("Failed to marshal message to protobuf: %+v", err))
+		return
+	}
+
+	msg := sarama.ProducerMessage{
+		Topic: kafka.Topic,
+		Value: sarama.ByteEncoder(message),
+	}
+
+	// Inject tracing info into message
+	span := createProducerSpan(ctx, &msg)
+	defer span.End()
+
+	// Send message and handle response
+	startTime := time.Now()
+	select {
+	case cs.KafkaProducerClient.Input() <- &msg:
+		select {
+		case successMsg := <-cs.KafkaProducerClient.Successes():
+			span.SetAttributes(
+				attribute.Bool("messaging.kafka.producer.success", true),
+				attribute.Int("messaging.kafka.producer.duration_ms", int(time.Since(startTime).Milliseconds())),
+				attribute.KeyValue(semconv.MessagingKafkaMessageOffset(int(successMsg.Offset))),
+			)
+			logger.Info(fmt.Sprintf("Successful to write message. offset: %v, duration: %v", successMsg.Offset, time.Since(startTime)))
+		case errMsg := <-cs.KafkaProducerClient.Errors():
+			span.SetAttributes(
+				attribute.Bool("messaging.kafka.producer.success", false),
+				attribute.Int("messaging.kafka.producer.duration_ms", int(time.Since(startTime).Milliseconds())),
+			)
+			span.SetStatus(otelcodes.Error, errMsg.Err.Error())
+			logger.Error(fmt.Sprintf("Failed to write message: %v", errMsg.Err))
+		case <-ctx.Done():
+			span.SetAttributes(
+				attribute.Bool("messaging.kafka.producer.success", false),
+				attribute.Int("messaging.kafka.producer.duration_ms", int(time.Since(startTime).Milliseconds())),
+			)
+			span.SetStatus(otelcodes.Error, "Context cancelled: "+ctx.Err().Error())
+			logger.Warn(fmt.Sprintf("Context canceled before success message received: %v", ctx.Err()))
+		}
+	case <-ctx.Done():
+		span.SetAttributes(
+			attribute.Bool("messaging.kafka.producer.success", false),
+			attribute.Int("messaging.kafka.producer.duration_ms", int(time.Since(startTime).Milliseconds())),
+		)
+		span.SetStatus(otelcodes.Error, "Failed to send: "+ctx.Err().Error())
+		logger.Error(fmt.Sprintf("Failed to send message to Kafka within context deadline: %v", ctx.Err()))
+		return
+	}
+
+	ffValue := cs.getIntFeatureFlag(ctx, "kafkaQueueProblems")
+	if ffValue > 0 {
+		logger.Info("Warning: FeatureFlag 'kafkaQueueProblems' is activated, overloading queue now.")
+		for i := 0; i < ffValue; i++ {
+			go func(i int) {
+				cs.KafkaProducerClient.Input() <- &msg
+				_ = <-cs.KafkaProducerClient.Successes()
+			}(i)
+		}
+		logger.Info(fmt.Sprintf("Done with #%d messages for overload simulation.", ffValue))
+	}
+}
+
+func createProducerSpan(ctx context.Context, msg *sarama.ProducerMessage) trace.Span {
+	spanContext, span := tracer.Start(
+		ctx,
+		fmt.Sprintf("%s publish", msg.Topic),
+		trace.WithSpanKind(trace.SpanKindProducer),
+		trace.WithAttributes(
+			semconv.PeerService("kafka"),
+			semconv.NetworkTransportTCP,
+			semconv.MessagingSystemKafka,
+			semconv.MessagingDestinationName(msg.Topic),
+			semconv.MessagingOperationPublish,
+			semconv.MessagingKafkaDestinationPartition(int(msg.Partition)),
+		),
+	)
+
+	carrier := propagation.MapCarrier{}
+	propagator := otel.GetTextMapPropagator()
+	propagator.Inject(spanContext, carrier)
+
+	for key, value := range carrier {
+		msg.Headers = append(msg.Headers, sarama.RecordHeader{Key: []byte(key), Value: []byte(value)})
+	}
+
+	return span
+}
+
+func (cs *checkout) isFeatureFlagEnabled(ctx context.Context, featureFlagName string) bool {
+	client := openfeature.NewClient("checkout")
+
+	// Default value is set to false, but you could also make this a parameter.
+	featureEnabled, _ := client.BooleanValue(
+		ctx,
+		featureFlagName,
+		false,
+		openfeature.EvaluationContext{},
+	)
+
+	return featureEnabled
+}
+
+func (cs *checkout) getIntFeatureFlag(ctx context.Context, featureFlagName string) int {
+	client := openfeature.NewClient("checkout")
+
+	// Default value is set to 0, but you could also make this a parameter.
+	featureFlagValue, _ := client.IntValue(
+		ctx,
+		featureFlagName,
+		0,
+		openfeature.EvaluationContext{},
+	)
+
+	return int(featureFlagValue)
+}
diff --git a/src/checkout/money/money.go b/src/checkout/money/money.go
new file mode 100644
index 0000000..ba21cd8
--- /dev/null
+++ b/src/checkout/money/money.go
@@ -0,0 +1,120 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+package money
+
+import (
+	"errors"
+
+	pb "github.com/open-telemetry/opentelemetry-demo/src/checkout/genproto/oteldemo"
+)
+
+const (
+	nanosMin = -999999999
+	nanosMax = +999999999
+	nanosMod = 1000000000
+)
+
+var (
+	ErrInvalidValue        = errors.New("one of the specified money values is invalid")
+	ErrMismatchingCurrency = errors.New("mismatching currency codes")
+)
+
+// IsValid checks if specified value has a valid units/nanos signs and ranges.
+func IsValid(m *pb.Money) bool {
+	return signMatches(m) && validNanos(m.GetNanos())
+}
+
+func signMatches(m *pb.Money) bool {
+	return m.GetNanos() == 0 || m.GetUnits() == 0 || (m.GetNanos() < 0) == (m.GetUnits() < 0)
+}
+
+func validNanos(nanos int32) bool { return nanosMin <= nanos && nanos <= nanosMax }
+
+// IsZero returns true if the specified money value is equal to zero.
+func IsZero(m *pb.Money) bool { return m.GetUnits() == 0 && m.GetNanos() == 0 }
+
+// IsPositive returns true if the specified money value is valid and is
+// positive.
+func IsPositive(m *pb.Money) bool {
+	return IsValid(m) && m.GetUnits() > 0 || (m.GetUnits() == 0 && m.GetNanos() > 0)
+}
+
+// IsNegative returns true if the specified money value is valid and is
+// negative.
+func IsNegative(m *pb.Money) bool {
+	return IsValid(m) && m.GetUnits() < 0 || (m.GetUnits() == 0 && m.GetNanos() < 0)
+}
+
+// AreSameCurrency returns true if values l and r have a currency code and
+// they are the same values.
+func AreSameCurrency(l, r *pb.Money) bool {
+	return l.GetCurrencyCode() == r.GetCurrencyCode() && l.GetCurrencyCode() != ""
+}
+
+// AreEquals returns true if values l and r are the equal, including the
+// currency. This does not check validity of the provided values.
+func AreEquals(l, r *pb.Money) bool {
+	return l.GetCurrencyCode() == r.GetCurrencyCode() &&
+		l.GetUnits() == r.GetUnits() && l.GetNanos() == r.GetNanos()
+}
+
+// Negate returns the same amount with the sign negated.
+func Negate(m *pb.Money) *pb.Money {
+	return &pb.Money{
+		Units:        -m.GetUnits(),
+		Nanos:        -m.GetNanos(),
+		CurrencyCode: m.GetCurrencyCode()}
+}
+
+// Must panics if the given error is not nil. This can be used with other
+// functions like: "m := Must(Sum(a,b))".
+func Must(v *pb.Money, err error) *pb.Money {
+	if err != nil {
+		panic(err)
+	}
+	return v
+}
+
+// Sum adds two values. Returns an error if one of the values are invalid or
+// currency codes are not matching (unless currency code is unspecified for
+// both).
+func Sum(l, r *pb.Money) (*pb.Money, error) {
+	if !IsValid(l) || !IsValid(r) {
+		return &pb.Money{}, ErrInvalidValue
+	} else if l.GetCurrencyCode() != r.GetCurrencyCode() {
+		return &pb.Money{}, ErrMismatchingCurrency
+	}
+	units := l.GetUnits() + r.GetUnits()
+	nanos := l.GetNanos() + r.GetNanos()
+
+	if (units == 0 && nanos == 0) || (units > 0 && nanos >= 0) || (units < 0 && nanos <= 0) {
+		// same sign <units, nanos>
+		units += int64(nanos / nanosMod)
+		nanos = nanos % nanosMod
+	} else {
+		// different sign. nanos guaranteed to not to go over the limit
+		if units > 0 {
+			units--
+			nanos += nanosMod
+		} else {
+			units++
+			nanos -= nanosMod
+		}
+	}
+
+	return &pb.Money{
+		Units:        units,
+		Nanos:        nanos,
+		CurrencyCode: l.GetCurrencyCode()}, nil
+}
+
+// MultiplySlow is a slow multiplication operation done through adding the value
+// to itself n-1 times.
+func MultiplySlow(m *pb.Money, n uint32) *pb.Money {
+	out := m
+	for n > 1 {
+		out = Must(Sum(out, m))
+		n--
+	}
+	return out
+}
diff --git a/src/checkout/money/money_test.go b/src/checkout/money/money_test.go
new file mode 100644
index 0000000..8c2c3d7
--- /dev/null
+++ b/src/checkout/money/money_test.go
@@ -0,0 +1,233 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+package money
+
+import (
+	"fmt"
+	"reflect"
+	"testing"
+
+	pb "github.com/open-telemetry/opentelemetry-demo/src/checkout/genproto/oteldemo"
+)
+
+func mmc(u int64, n int32, c string) *pb.Money { return &pb.Money{Units: u, Nanos: n, CurrencyCode: c} }
+func mm(u int64, n int32) *pb.Money            { return mmc(u, n, "") }
+
+func TestIsValid(t *testing.T) {
+	tests := []struct {
+		name string
+		in   *pb.Money
+		want bool
+	}{
+		{"valid -/-", mm(-981273891273, -999999999), true},
+		{"invalid -/+", mm(-981273891273, +999999999), false},
+		{"valid +/+", mm(981273891273, 999999999), true},
+		{"invalid +/-", mm(981273891273, -999999999), false},
+		{"invalid +/+overflow", mm(3, 1000000000), false},
+		{"invalid +/-overflow", mm(3, -1000000000), false},
+		{"invalid -/+overflow", mm(-3, 1000000000), false},
+		{"invalid -/-overflow", mm(-3, -1000000000), false},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := IsValid(tt.in); got != tt.want {
+				t.Errorf("IsValid(%v) = %v, want %v", tt.in, got, tt.want)
+			}
+		})
+	}
+}
+
+func TestIsZero(t *testing.T) {
+	tests := []struct {
+		name string
+		in   *pb.Money
+		want bool
+	}{
+		{"zero", mm(0, 0), true},
+		{"not-zero (-/+)", mm(-1, +1), false},
+		{"not-zero (-/-)", mm(-1, -1), false},
+		{"not-zero (+/+)", mm(+1, +1), false},
+		{"not-zero (+/-)", mm(+1, -1), false},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := IsZero(tt.in); got != tt.want {
+				t.Errorf("IsZero(%v) = %v, want %v", tt.in, got, tt.want)
+			}
+		})
+	}
+}
+
+func TestIsPositive(t *testing.T) {
+	tests := []struct {
+		name string
+		in   *pb.Money
+		want bool
+	}{
+		{"zero", mm(0, 0), false},
+		{"positive (+/+)", mm(+1, +1), true},
+		{"invalid (-/+)", mm(-1, +1), false},
+		{"negative (-/-)", mm(-1, -1), false},
+		{"invalid (+/-)", mm(+1, -1), false},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := IsPositive(tt.in); got != tt.want {
+				t.Errorf("IsPositive(%v) = %v, want %v", tt.in, got, tt.want)
+			}
+		})
+	}
+}
+
+func TestIsNegative(t *testing.T) {
+	tests := []struct {
+		name string
+		in   *pb.Money
+		want bool
+	}{
+		{"zero", mm(0, 0), false},
+		{"positive (+/+)", mm(+1, +1), false},
+		{"invalid (-/+)", mm(-1, +1), false},
+		{"negative (-/-)", mm(-1, -1), true},
+		{"invalid (+/-)", mm(+1, -1), false},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := IsNegative(tt.in); got != tt.want {
+				t.Errorf("IsNegative(%v) = %v, want %v", tt.in, got, tt.want)
+			}
+		})
+	}
+}
+
+func TestAreSameCurrency(t *testing.T) {
+	type args struct {
+		l *pb.Money
+		r *pb.Money
+	}
+	tests := []struct {
+		name string
+		args args
+		want bool
+	}{
+		{"both empty currency", args{mmc(1, 0, ""), mmc(2, 0, "")}, false},
+		{"left empty currency", args{mmc(1, 0, ""), mmc(2, 0, "USD")}, false},
+		{"right empty currency", args{mmc(1, 0, "USD"), mmc(2, 0, "")}, false},
+		{"mismatching", args{mmc(1, 0, "USD"), mmc(2, 0, "CAD")}, false},
+		{"matching", args{mmc(1, 0, "USD"), mmc(2, 0, "USD")}, true},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := AreSameCurrency(tt.args.l, tt.args.r); got != tt.want {
+				t.Errorf("AreSameCurrency([%v],[%v]) = %v, want %v", tt.args.l, tt.args.r, got, tt.want)
+			}
+		})
+	}
+}
+
+func TestAreEquals(t *testing.T) {
+	type args struct {
+		l *pb.Money
+		r *pb.Money
+	}
+	tests := []struct {
+		name string
+		args args
+		want bool
+	}{
+		{"equals", args{mmc(1, 2, "USD"), mmc(1, 2, "USD")}, true},
+		{"mismatching currency", args{mmc(1, 2, "USD"), mmc(1, 2, "CAD")}, false},
+		{"mismatching units", args{mmc(10, 20, "USD"), mmc(1, 20, "USD")}, false},
+		{"mismatching nanos", args{mmc(1, 2, "USD"), mmc(1, 20, "USD")}, false},
+		{"negated", args{mmc(1, 2, "USD"), mmc(-1, -2, "USD")}, false},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := AreEquals(tt.args.l, tt.args.r); got != tt.want {
+				t.Errorf("AreEquals([%v],[%v]) = %v, want %v", tt.args.l, tt.args.r, got, tt.want)
+			}
+		})
+	}
+}
+
+func TestNegate(t *testing.T) {
+	tests := []struct {
+		name string
+		in   *pb.Money
+		want *pb.Money
+	}{
+		{"zero", mm(0, 0), mm(0, 0)},
+		{"negative", mm(-1, -200), mm(1, 200)},
+		{"positive", mm(1, 200), mm(-1, -200)},
+		{"carries currency code", mmc(0, 0, "XXX"), mmc(0, 0, "XXX")},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := Negate(tt.in); !AreEquals(got, tt.want) {
+				t.Errorf("Negate([%v]) = %v, want %v", tt.in, got, tt.want)
+			}
+		})
+	}
+}
+
+func TestMust_pass(t *testing.T) {
+	v := Must(mm(2, 3), nil)
+	if !AreEquals(v, mm(2, 3)) {
+		t.Errorf("returned the wrong value: %v", v)
+	}
+}
+
+func TestMust_panic(t *testing.T) {
+	defer func() {
+		if r := recover(); r != nil {
+			t.Logf("panic captured: %v", r)
+		}
+	}()
+	Must(mm(2, 3), fmt.Errorf("some error"))
+	t.Fatal("this should not have executed due to the panic above")
+}
+
+func TestSum(t *testing.T) {
+	type args struct {
+		l *pb.Money
+		r *pb.Money
+	}
+	tests := []struct {
+		name    string
+		args    args
+		want    *pb.Money
+		wantErr error
+	}{
+		{"0+0=0", args{mm(0, 0), mm(0, 0)}, mm(0, 0), nil},
+		{"Error: currency code on left", args{mmc(0, 0, "XXX"), mm(0, 0)}, mm(0, 0), ErrMismatchingCurrency},
+		{"Error: currency code on right", args{mm(0, 0), mmc(0, 0, "YYY")}, mm(0, 0), ErrMismatchingCurrency},
+		{"Error: currency code mismatch", args{mmc(0, 0, "AAA"), mmc(0, 0, "BBB")}, mm(0, 0), ErrMismatchingCurrency},
+		{"Error: invalid +/-", args{mm(+1, -1), mm(0, 0)}, mm(0, 0), ErrInvalidValue},
+		{"Error: invalid -/+", args{mm(0, 0), mm(-1, +2)}, mm(0, 0), ErrInvalidValue},
+		{"Error: invalid nanos", args{mm(0, 1000000000), mm(1, 0)}, mm(0, 0), ErrInvalidValue},
+		{"both positive (no carry)", args{mm(2, 200000000), mm(2, 200000000)}, mm(4, 400000000), nil},
+		{"both positive (nanos=max)", args{mm(2, 111111111), mm(2, 888888888)}, mm(4, 999999999), nil},
+		{"both positive (carry)", args{mm(2, 200000000), mm(2, 900000000)}, mm(5, 100000000), nil},
+		{"both negative (no carry)", args{mm(-2, -200000000), mm(-2, -200000000)}, mm(-4, -400000000), nil},
+		{"both negative (carry)", args{mm(-2, -200000000), mm(-2, -900000000)}, mm(-5, -100000000), nil},
+		{"mixed (larger positive, just decimals)", args{mm(11, 0), mm(-2, 0)}, mm(9, 0), nil},
+		{"mixed (larger negative, just decimals)", args{mm(-11, 0), mm(2, 0)}, mm(-9, 0), nil},
+		{"mixed (larger positive, no borrow)", args{mm(11, 100000000), mm(-2, -100000000)}, mm(9, 0), nil},
+		{"mixed (larger positive, with borrow)", args{mm(11, 100000000), mm(-2, -9000000 /*.09*/)}, mm(9, 91000000 /*.091*/), nil},
+		{"mixed (larger negative, no borrow)", args{mm(-11, -100000000), mm(2, 100000000)}, mm(-9, 0), nil},
+		{"mixed (larger negative, with borrow)", args{mm(-11, -100000000), mm(2, 9000000 /*.09*/)}, mm(-9, -91000000 /*.091*/), nil},
+		{"0+negative", args{mm(0, 0), mm(-2, -100000000)}, mm(-2, -100000000), nil},
+		{"negative+0", args{mm(-2, -100000000), mm(0, 0)}, mm(-2, -100000000), nil},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := Sum(tt.args.l, tt.args.r)
+			if err != tt.wantErr {
+				t.Errorf("Sum([%v],[%v]): expected err=\"%v\" got=\"%v\"", tt.args.l, tt.args.r, tt.wantErr, err)
+			}
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("Sum([%v],[%v]) = %v, want %v", tt.args.l, tt.args.r, got, tt.want)
+			}
+		})
+	}
+}