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diff --git a/src/react-native-app/gateways/Api.gateway.ts b/src/react-native-app/gateways/Api.gateway.ts
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+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+/**
+ * Copied with modification from src/frontend/gateways/Api.gateway.ts
+ *
+ * TODO The React Native example only implements a subset of the functionality defined here, missing in particular is:
+ *  - showing ads
+ *  - showing recommendations
+ *  - calculating shipping costs
+ *  - currency conversion
+ */
+import {
+  Ad,
+  Address,
+  Cart,
+  CartItem,
+  Money,
+  PlaceOrderRequest,
+  Product,
+} from "@/protos/demo";
+import { IProductCart, IProductCartItem, IProductCheckout } from "@/types/Cart";
+import request from "@/utils/Request";
+import SessionGateway from "./Session.gateway";
+import { context, propagation } from "@opentelemetry/api";
+
+const basePath = "/api";
+
+const Apis = () => ({
+  async getCart(currencyCode: string) {
+    const { userId } = await SessionGateway.getSession();
+    return request<IProductCart>({
+      url: `${basePath}/cart`,
+      queryParams: { sessionId: userId, currencyCode },
+    });
+  },
+  async addCartItem({
+    currencyCode,
+    ...item
+  }: CartItem & { currencyCode: string }) {
+    const { userId } = await SessionGateway.getSession();
+    return request<Cart>({
+      url: `${basePath}/cart`,
+      body: { item, userId },
+      queryParams: { currencyCode },
+      method: "POST",
+    });
+  },
+  async emptyCart() {
+    const { userId } = await SessionGateway.getSession();
+    return request<undefined>({
+      url: `${basePath}/cart`,
+      method: "DELETE",
+      body: { userId },
+    });
+  },
+
+  getSupportedCurrencyList() {
+    return request<string[]>({
+      url: `${basePath}/currency`,
+    });
+  },
+
+  getShippingCost(
+    itemList: IProductCartItem[],
+    currencyCode: string,
+    address: Address,
+  ) {
+    return request<Money>({
+      url: `${basePath}/shipping`,
+      queryParams: {
+        itemList: JSON.stringify(
+          itemList.map(({ productId, quantity }) => ({ productId, quantity })),
+        ),
+        currencyCode,
+        address: JSON.stringify(address),
+      },
+    });
+  },
+
+  placeOrder({
+    currencyCode,
+    ...order
+  }: PlaceOrderRequest & { currencyCode: string }) {
+    return request<IProductCheckout>({
+      url: `${basePath}/checkout`,
+      method: "POST",
+      queryParams: { currencyCode },
+      body: order,
+    });
+  },
+
+  listProducts(currencyCode: string) {
+    return request<Product[]>({
+      url: `${basePath}/products`,
+      queryParams: { currencyCode },
+    });
+  },
+  getProduct(productId: string, currencyCode: string) {
+    return request<Product>({
+      url: `${basePath}/products/${productId}`,
+      queryParams: { currencyCode },
+    });
+  },
+  async listRecommendations(productIds: string[], currencyCode: string) {
+    const { userId } = await SessionGateway.getSession();
+    return request<Product[]>({
+      url: `${basePath}/recommendations`,
+      queryParams: {
+        productIds,
+        sessionId: userId,
+        currencyCode,
+      },
+    });
+  },
+  listAds(contextKeys: string[]) {
+    return request<Ad[]>({
+      url: `${basePath}/data`,
+      queryParams: {
+        contextKeys,
+      },
+    });
+  },
+});
+
+/**
+ * Extends all the API calls to set baggage automatically.
+ */
+const ApiGateway = new Proxy(Apis(), {
+  get(target, prop, receiver) {
+    const originalFunction = Reflect.get(target, prop, receiver);
+
+    if (typeof originalFunction !== "function") {
+      return originalFunction;
+    }
+
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    return async function (...args: any[]) {
+      const { userId } = await SessionGateway.getSession();
+      const baggage =
+        propagation.getActiveBaggage() || propagation.createBaggage();
+      const newBaggage = baggage.setEntry("session.id", { value: userId });
+      const newContext = propagation.setBaggage(context.active(), newBaggage);
+      return context.with(newContext, () => {
+        return Reflect.apply(originalFunction, undefined, args);
+      });
+    };
+  },
+});
+
+export default ApiGateway;