fix(subscription): preselect pay channel before navigation

src/lib/payment/__tests__/pending_payment_order.test.ts

@@ -0,0 +1,15 @@
+import { describe, expect, it } from "vitest";
+
+import { buildPendingPaymentSubscriptionUrl } from "../pending_payment_order";
+
+describe("pending payment order helpers", () => {
+  it("keeps the pay channel when rebuilding subscription return urls", () => {
+    expect(
+      buildPendingPaymentSubscriptionUrl({
+        payChannel: "ezpay",
+        returnTo: "chat",
+        subscriptionType: "topup",
+      }),
+    ).toBe("/subscription?type=topup&payChannel=ezpay&paymentReturn=1&returnTo=chat");
+  });
+});

src/lib/payment/default_pay_channel.ts

@@ -0,0 +1,7 @@
+import type { PayChannel } from "@/data/dto/payment";
+
+export function getDefaultPayChannelForCountryCode(
+  countryCode: string | null | undefined,
+): PayChannel {
+  return countryCode?.trim().toUpperCase() === "PH" ? "ezpay" : "stripe";
+}

src/lib/payment/pending_payment_order.ts

@@ -43,10 +43,14 @@ export function clearPendingPaymentOrder(): Promise<Result<void>> {
 }
 
 export function buildPendingPaymentSubscriptionUrl(
-  order: Pick<PendingPaymentOrder, "subscriptionType" | "returnTo">,
+  order: Pick<
+    PendingPaymentOrder,
+    "payChannel" | "returnTo" | "subscriptionType"
+  >,
 ): string {
   const params = new URLSearchParams({
     type: order.subscriptionType,
+    payChannel: order.payChannel,
     paymentReturn: "1",
   });
   if (order.returnTo) params.set("returnTo", order.returnTo);