fix: return mobile billing portals to the canonical app host

apps/maple-research/frontend/src/billing/billingApi.ts

@@ -1,5 +1,5 @@
 import { isAndroid, isMobile, isTauri } from "@/utils/platform";
-import { billingReturnOrigin } from "./returnOrigin";
+import { billingPortalReturnOrigin } from "./returnOrigin";
 import {
   isAllowedZapriteCheckoutUrl,
   parseBillingApiError,
@@ -177,7 +177,7 @@ export async function fetchProducts(version?: string): Promise<BillingProduct[]>
 export async function fetchPortalUrl(thirdPartyToken: string): Promise<string> {
   assertPurchasingAvailable();
   const requestBody = {
-    return_url: billingReturnOrigin()
+    return_url: billingPortalReturnOrigin()
   };
 
   const response = await fetch(

apps/maple-research/frontend/src/billing/returnOrigin.test.ts

@@ -1,7 +1,7 @@
 import { afterEach, beforeEach, describe, expect, spyOn, test } from "bun:test";
 import * as platform from "@/utils/platform";
 import { fetchPortalUrl } from "./billingApi";
-import { billingReturnOrigin } from "./returnOrigin";
+import { billingPortalReturnOrigin, billingReturnOrigin } from "./returnOrigin";
 
 describe("billing browser returns", () => {
   const previousBillingApi = process.env.VITE_MAPLE_BILLING_API_URL;
@@ -67,6 +67,7 @@ describe("billing browser returns", () => {
       Object.defineProperty(window.location, "origin", { value: origin, configurable: true });
       process.env.VITE_MAPLE_BILLING_API_URL = "https://billing-dev.opensecret.cloud";
       expect(billingReturnOrigin()).toBe(origin);
+      expect(billingPortalReturnOrigin()).toBe(origin);
     });
   }
 
@@ -75,4 +76,26 @@ describe("billing browser returns", () => {
     process.env.VITE_MAPLE_BILLING_API_URL = "https://billing-dev.opensecret.cloud";
     expect(billingReturnOrigin()).toBe("https://trymaple.ai");
   });
+
+  for (const [api, origin] of [
+    ["https://billing-dev.opensecret.cloud", "https://app-dev.maple.ai"],
+    ["https://billing-dev.opensecret.cloud/", "https://app-dev.maple.ai"],
+    ["https://billing.opensecret.cloud", "https://app.maple.ai"]
+  ]) {
+    test(`mobile portal returns directly to ${origin} without changing payment links`, async () => {
+      spyOn(platform, "isMobile").mockReturnValue(true);
+      process.env.VITE_MAPLE_BILLING_API_URL = api;
+      const request = spyOn(globalThis, "fetch").mockResolvedValue(
+        Response.json({ portal_url: "https://billing.stripe.com/p/session/test" })
+      );
+      cleanup.push(() => request.mockRestore());
+
+      await fetchPortalUrl("fixture-token");
+      expect(request).toHaveBeenCalledTimes(1);
+      expect(JSON.parse(String(request.mock.calls[0][1]?.body))).toEqual({
+        return_url: origin
+      });
+      expect(billingReturnOrigin()).toBe("https://trymaple.ai");
+    });
+  }
 });

apps/maple-research/frontend/src/billing/returnOrigin.ts

@@ -8,7 +8,16 @@ export function billingReturnOrigin(): string {
   // Keep the existing Universal/App Link host for mobile clients.
   if (isMobile()) return "https://trymaple.ai";
 
-  // PR desktop builds use hosted Dev billing without the mobile Dev app variant.
+  return nativeAppOrigin();
+}
+
+/** Portal exits stay on the website and do not need a mobile payment deep link. */
+export function billingPortalReturnOrigin(): string {
+  return isTauri() ? nativeAppOrigin() : window.location.origin;
+}
+
+function nativeAppOrigin(): string {
+  // PR builds can use hosted Dev billing without the mobile Dev app variant.
   return import.meta.env.VITE_MAPLE_BILLING_API_URL?.replace(/\/+$/, "") ===
     "https://billing-dev.opensecret.cloud"
     ? "https://app-dev.maple.ai"