feat(payment): share payment method selector

src/app/_components/payment/__tests__/payment-method-selector.test.tsx

@@ -0,0 +1,55 @@
+import { renderToStaticMarkup } from "react-dom/server";
+import { describe, expect, it } from "vitest";
+
+import { PaymentMethodSelector } from "../payment-method-selector";
+
+describe("PaymentMethodSelector", () => {
+  it("orders the default channel first and renders page analytics", () => {
+    const html = renderToStaticMarkup(
+      <PaymentMethodSelector
+        value="ezpay"
+        defaultChannel="ezpay"
+        caption="GCash by default"
+        analyticsKey="tip.payment_method"
+        onChange={() => undefined}
+      />,
+    );
+
+    expect(html).toContain('aria-labelledby="payment-method-title"');
+    expect(html).toContain("Payment Method");
+    expect(html).toContain("GCash by default");
+    expect(html.indexOf('aria-label="GCash"')).toBeLessThan(
+      html.indexOf('aria-label="Stripe"'),
+    );
+    const selectedButton = html.match(
+      /<button[^>]*aria-pressed="true"[^>]*>/,
+    )?.[0];
+    expect(selectedButton).toBeDefined();
+    expect(selectedButton).toContain(
+      'data-analytics-key="tip.payment_method"',
+    );
+    expect(selectedButton).toContain("border-[#f657a0]");
+    expect(selectedButton).not.toContain("border-[rgba(246,87,160,0.18)]");
+    expect(selectedButton).toContain("bg-[#fff4f9]");
+    expect(selectedButton).not.toContain("bg-white");
+    expect(selectedButton).toContain("0_0_0_3px_rgba(217,47,127,0.18)");
+    expect(selectedButton).toContain("-translate-y-0.5");
+    expect(html).toContain("/images/subscription/gcash-logo.svg");
+  });
+
+  it("disables both payment methods while payment is busy", () => {
+    const html = renderToStaticMarkup(
+      <PaymentMethodSelector
+        value="stripe"
+        disabled
+        analyticsKey="subscription.payment_method"
+        onChange={() => undefined}
+      />,
+    );
+
+    expect(html.match(/ disabled=""/g)).toHaveLength(2);
+    expect(html).toContain(
+      'data-analytics-key="subscription.payment_method"',
+    );
+  });
+});

src/app/_components/payment/payment-method-selector.tsx

@@ -4,7 +4,7 @@ import Image from "next/image";
 
 import type { PayChannel } from "@/data/schemas/payment";
 
-const PAYMENT_METHODS: {
+const PAYMENT_METHODS: readonly {
   channel: PayChannel;
   title: string;
   logoSrc?: string;
@@ -20,21 +20,23 @@ const PAYMENT_METHODS: {
   },
 ];
 
-export interface SubscriptionPaymentMethodProps {
+export interface PaymentMethodSelectorProps {
   value: PayChannel;
   defaultChannel?: PayChannel;
   disabled?: boolean;
   caption?: string;
+  analyticsKey: string;
   onChange: (channel: PayChannel) => void;
 }
 
-export function SubscriptionPaymentMethod({
+export function PaymentMethodSelector({
   value,
   defaultChannel = "stripe",
   disabled = false,
   caption = "Stripe by default",
+  analyticsKey,
   onChange,
-}: SubscriptionPaymentMethodProps) {
+}: PaymentMethodSelectorProps) {
   const paymentMethods =
     defaultChannel === "ezpay"
       ? [...PAYMENT_METHODS].sort((a, b) =>
@@ -75,7 +77,7 @@ export function SubscriptionPaymentMethod({
             <button
               key={method.channel}
               type="button"
-              data-analytics-key="subscription.payment_method"
+              data-analytics-key={analyticsKey}
               data-analytics-label="Select payment method"
               className={classes}
               disabled={disabled}

src/app/_hooks/__tests__/use-payment-method-selection.test.tsx

@@ -0,0 +1,107 @@
+import { act } from "react";
+import { createRoot, type Root } from "react-dom/client";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+
+import type { PayChannel } from "@/data/schemas/payment";
+import type { PaymentMethodConfig } from "@/lib/payment/payment_method";
+
+import { usePaymentMethodSelection } from "../use-payment-method-selection";
+
+describe("usePaymentMethodSelection", () => {
+  let container: HTMLDivElement;
+  let root: Root;
+
+  beforeEach(() => {
+    (globalThis as { IS_REACT_ACT_ENVIRONMENT?: boolean })
+      .IS_REACT_ACT_ENVIRONMENT = true;
+    container = document.createElement("div");
+    document.body.appendChild(container);
+    root = createRoot(container);
+  });
+
+  afterEach(() => {
+    act(() => root.unmount());
+    container.remove();
+  });
+
+  it("forces Stripe when payment method selection is unavailable", () => {
+    const onChange = vi.fn();
+    renderHarness(root, {
+      config: { canChoosePaymentMethod: false, initialPayChannel: "stripe" },
+      currentPayChannel: "ezpay",
+      onChange,
+    });
+
+    expect(onChange).toHaveBeenCalledWith("stripe");
+  });
+
+  it("applies the default channel once when no return channel was requested", () => {
+    const onChange = vi.fn();
+    const config = {
+      canChoosePaymentMethod: true,
+      initialPayChannel: "ezpay",
+    } as const;
+    renderHarness(root, {
+      config,
+      currentPayChannel: "stripe",
+      onChange,
+    });
+    renderHarness(root, {
+      config,
+      currentPayChannel: "ezpay",
+      onChange,
+    });
+
+    expect(onChange).toHaveBeenCalledTimes(1);
+    expect(onChange).toHaveBeenCalledWith("ezpay");
+  });
+
+  it("preserves an explicit return channel and pauses while payment is busy", () => {
+    const onChange = vi.fn();
+    renderHarness(root, {
+      config: { canChoosePaymentMethod: true, initialPayChannel: "ezpay" },
+      currentPayChannel: "stripe",
+      requestedPayChannel: "stripe",
+      onChange,
+    });
+    renderHarness(root, {
+      config: { canChoosePaymentMethod: false, initialPayChannel: "stripe" },
+      currentPayChannel: "ezpay",
+      isPaymentBusy: true,
+      onChange,
+    });
+
+    expect(onChange).not.toHaveBeenCalled();
+  });
+});
+
+interface HarnessProps {
+  config: PaymentMethodConfig;
+  currentPayChannel: PayChannel;
+  requestedPayChannel?: PayChannel | null;
+  isPaymentBusy?: boolean;
+  onChange: (payChannel: PayChannel) => void;
+}
+
+function renderHarness(root: Root, props: HarnessProps): void {
+  act(() => {
+    root.render(<Harness {...props} />);
+  });
+}
+
+function Harness({
+  config,
+  currentPayChannel,
+  requestedPayChannel = null,
+  isPaymentBusy = false,
+  onChange,
+}: HarnessProps) {
+  usePaymentMethodSelection({
+    config,
+    currentPayChannel,
+    requestedPayChannel,
+    isPaymentBusy,
+    onChange,
+  });
+  return null;
+}

src/app/_hooks/use-payment-method-selection.ts

@@ -0,0 +1,49 @@
+"use client";
+
+import { useEffect, useRef } from "react";
+
+import type { PayChannel } from "@/data/schemas/payment";
+import type { PaymentMethodConfig } from "@/lib/payment/payment_method";
+
+export interface UsePaymentMethodSelectionInput {
+  config: PaymentMethodConfig;
+  currentPayChannel: PayChannel;
+  isPaymentBusy: boolean;
+  requestedPayChannel: PayChannel | null;
+  onChange: (payChannel: PayChannel) => void;
+}
+
+export function usePaymentMethodSelection({
+  config,
+  currentPayChannel,
+  isPaymentBusy,
+  requestedPayChannel,
+  onChange,
+}: UsePaymentMethodSelectionInput): void {
+  const appliedDefaultChannelRef = useRef<PayChannel | null>(null);
+
+  useEffect(() => {
+    if (isPaymentBusy) return;
+
+    if (!config.canChoosePaymentMethod) {
+      appliedDefaultChannelRef.current = null;
+      if (currentPayChannel !== "stripe") onChange("stripe");
+      return;
+    }
+
+    if (requestedPayChannel !== null) return;
+    if (appliedDefaultChannelRef.current === config.initialPayChannel) return;
+    appliedDefaultChannelRef.current = config.initialPayChannel;
+
+    if (currentPayChannel !== config.initialPayChannel) {
+      onChange(config.initialPayChannel);
+    }
+  }, [
+    config.canChoosePaymentMethod,
+    config.initialPayChannel,
+    currentPayChannel,
+    isPaymentBusy,
+    onChange,
+    requestedPayChannel,
+  ]);
+}

src/app/subscription/__tests__/subscription-screen.helpers.test.ts

@@ -1,4 +1,4 @@
-import { afterEach, describe, expect, it, vi } from "vitest";
+import { describe, expect, it } from "vitest";
 
 import {
   PaymentPlanSchema,
@@ -7,12 +7,9 @@ import {
 } from "@/data/schemas/payment";
 
 import {
-  canChooseSubscriptionPayChannel,
   findSelectedSubscriptionPlan,
-  getDefaultPayChannelForCountryCode,
   getDefaultSubscriptionPlanId,
   getFirstRechargeOfferView,
-  resolveSubscriptionPayChannel,
   toCoinsOfferPlanViews,
   toVipOfferPlanViews,
 } from "../subscription-screen.helpers";
@@ -34,68 +31,6 @@ function makePlan(overrides: Partial<PaymentPlanInput>): PaymentPlan {
 }
 
 describe("subscription screen helpers", () => {
-  afterEach(() => {
-    vi.unstubAllEnvs();
-  });
-
-  it("defaults Philippines users to GCash and other countries to Stripe", () => {
-    expect(getDefaultPayChannelForCountryCode("PH")).toBe("ezpay");
-    expect(getDefaultPayChannelForCountryCode("ph")).toBe("ezpay");
-    expect(getDefaultPayChannelForCountryCode("HK")).toBe("stripe");
-    expect(getDefaultPayChannelForCountryCode("")).toBe("stripe");
-    expect(getDefaultPayChannelForCountryCode(null)).toBe("stripe");
-  });
-
-  it("only allows payment method switching for Philippines users in production", () => {
-    vi.stubEnv("NEXT_PUBLIC_APP_ENV", "production");
-
-    expect(canChooseSubscriptionPayChannel("PH")).toBe(true);
-    expect(canChooseSubscriptionPayChannel("ph")).toBe(true);
-    expect(canChooseSubscriptionPayChannel("HK")).toBe(false);
-    expect(canChooseSubscriptionPayChannel(null)).toBe(false);
-  });
-
-  it("allows payment method switching in non-production", () => {
-    vi.stubEnv("NEXT_PUBLIC_APP_ENV", "test");
-
-    expect(canChooseSubscriptionPayChannel("HK")).toBe(true);
-    expect(canChooseSubscriptionPayChannel(null)).toBe(true);
-  });
-
-  it("resolves subscription pay channel by country in production", () => {
-    vi.stubEnv("NEXT_PUBLIC_APP_ENV", "production");
-
-    expect(
-      resolveSubscriptionPayChannel({
-        countryCode: "PH",
-        requestedPayChannel: null,
-      }),
-    ).toBe("ezpay");
-    expect(
-      resolveSubscriptionPayChannel({
-        countryCode: "PH",
-        requestedPayChannel: "stripe",
-      }),
-    ).toBe("stripe");
-    expect(
-      resolveSubscriptionPayChannel({
-        countryCode: "HK",
-        requestedPayChannel: "ezpay",
-      }),
-    ).toBe("stripe");
-  });
-
-  it("keeps requested pay channel in non-production", () => {
-    vi.stubEnv("NEXT_PUBLIC_APP_ENV", "test");
-
-    expect(
-      resolveSubscriptionPayChannel({
-        countryCode: "HK",
-        requestedPayChannel: "ezpay",
-      }),
-    ).toBe("ezpay");
-  });
-
   it("maps at most three VIP plans and all coin plans", () => {
     const plans = [
       makePlan({ planId: "vip_monthly", planName: "Monthly" }),

src/app/subscription/components/__tests__/tailwind-components.test.tsx

@@ -4,7 +4,6 @@ import { describe, expect, it } from "vitest";
 import { StripePaymentDialog } from "@/app/_components/payment/stripe-payment-dialog";
 
 import { SubscriptionCtaButton } from "../subscription-cta-button";
-import { SubscriptionPaymentMethod } from "../subscription-payment-method";
 import { SubscriptionPaymentSuccessDialog } from "../subscription-payment-success-dialog";
 import { SubscriptionCoinsOfferSection } from "../subscription-coins-offer-section";
 import { SubscriptionVipOfferSection } from "../subscription-vip-offer-section";
@@ -49,38 +48,6 @@ describe("subscription Tailwind components", () => {
     expect(html).toContain("OK");
   });
 
-  it("renders SubscriptionPaymentMethod with default ordering and selection", () => {
-    const html = renderToStaticMarkup(
-      <SubscriptionPaymentMethod
-        value="ezpay"
-        defaultChannel="ezpay"
-        caption="GCash by default"
-        onChange={() => undefined}
-      />,
-    );
-
-    expect(html).toContain('aria-labelledby="payment-method-title"');
-    expect(html).toContain("Payment Method");
-    expect(html).toContain("GCash by default");
-    expect(html.indexOf('aria-label="GCash"')).toBeLessThan(
-      html.indexOf('aria-label="Stripe"'),
-    );
-    const selectedButton = html.match(
-      /<button[^>]*aria-pressed="true"[^>]*>/,
-    )?.[0];
-    expect(selectedButton).toBeDefined();
-    expect(selectedButton).toContain(
-      'data-analytics-key="subscription.payment_method"',
-    );
-    expect(selectedButton).toContain("border-[#f657a0]");
-    expect(selectedButton).not.toContain("border-[rgba(246,87,160,0.18)]");
-    expect(selectedButton).toContain("bg-[#fff4f9]");
-    expect(selectedButton).not.toContain("bg-white");
-    expect(selectedButton).toContain("0_0_0_3px_rgba(217,47,127,0.18)");
-    expect(selectedButton).toContain("-translate-y-0.5");
-    expect(html).toContain("/images/subscription/gcash-logo.svg");
-  });
-
   it("renders StripePaymentDialog fallback with Tailwind dialog utilities", () => {
     const html = renderToStaticMarkup(
       <StripePaymentDialog

src/app/subscription/components/index.ts

@@ -5,6 +5,5 @@
 export * from "./subscription-checkout-button";
 export * from "./subscription-coins-offer-section";
 export * from "./subscription-cta-button";
-export * from "./subscription-payment-method";
 export * from "./subscription-payment-success-dialog";
 export * from "./subscription-vip-offer-section";

src/app/subscription/subscription-screen.helpers.ts

@@ -1,7 +1,4 @@
-import type { PayChannel, PaymentPlan } from "@/data/schemas/payment";
-import { getDefaultPayChannelForCountryCode } from "@/lib/payment/default_pay_channel";
-import { AppEnvUtil } from "@/utils/app-env";
-export { getDefaultPayChannelForCountryCode } from "@/lib/payment/default_pay_channel";
+import type { PaymentPlan } from "@/data/schemas/payment";
 
 import type { CoinsOfferPlanView } from "./components/subscription-coins-offer-section";
 import type { VipOfferPlanView } from "./components/subscription-vip-offer-section";
@@ -15,24 +12,6 @@ export interface FirstRechargeOfferView {
   renewalNotice: string | null;
 }
 
-export function canChooseSubscriptionPayChannel(
-  countryCode: string | null | undefined,
-): boolean {
-  if (!AppEnvUtil.isProduction()) return true;
-  return countryCode?.trim().toUpperCase() === "PH";
-}
-
-export function resolveSubscriptionPayChannel(input: {
-  countryCode: string | null | undefined;
-  requestedPayChannel: PayChannel | null | undefined;
-}): PayChannel {
-  if (!canChooseSubscriptionPayChannel(input.countryCode)) return "stripe";
-  return (
-    input.requestedPayChannel ??
-    getDefaultPayChannelForCountryCode(input.countryCode)
-  );
-}
-
 export function isVipPlan(plan: PaymentPlan): boolean {
   return plan.vipDays !== null;
 }

src/app/subscription/subscription-screen.tsx

@@ -1,8 +1,10 @@
 "use client";
-import { useEffect, useMemo, useRef } from "react";
+import { useEffect, useMemo } from "react";
 
 import { BackButton } from "@/app/_components";
 import { Checkbox, MobileShell } from "@/app/_components/core";
+import { PaymentMethodSelector } from "@/app/_components/payment/payment-method-selector";
+import { usePaymentMethodSelection } from "@/app/_hooks/use-payment-method-selection";
 import { usePaymentPlanAnalytics } from "@/app/_hooks/use-payment-plan-analytics";
 import { AppConstants } from "@/core/app_constants";
 import type { PayChannel } from "@/data/schemas/payment";
@@ -13,22 +15,20 @@ import {
   getDefaultPaymentAnalyticsContext,
   type PaymentAnalyticsContext,
 } from "@/lib/analytics";
+import { getPaymentMethodConfig } from "@/lib/payment/payment_method";
 import { useUserState } from "@/stores/user/user-context";
 
 import {
   SubscriptionCheckoutButton,
   SubscriptionCoinsOfferSection,
-  SubscriptionPaymentMethod,
   SubscriptionPaymentSuccessDialog,
   SubscriptionVipOfferSection,
 } from "./components";
 import styles from "./components/subscription-screen.module.css";
 import {
   findSelectedSubscriptionPlan,
-  canChooseSubscriptionPayChannel,
   getFirstRechargeOfferView,
   getDefaultSubscriptionPlanId,
-  resolveSubscriptionPayChannel,
   toCoinsOfferPlanViews,
   toVipOfferPlanViews,
   type SubscriptionType,
@@ -56,13 +56,10 @@ export function SubscriptionScreen({
 }: SubscriptionScreenProps) {
   const userState = useUserState();
   const countryCode = userState.currentUser?.countryCode;
-  const canChoosePaymentMethod =
-    canChooseSubscriptionPayChannel(countryCode);
-  const resolvedInitialPayChannel = resolveSubscriptionPayChannel({
+  const paymentMethodConfig = getPaymentMethodConfig({
     countryCode,
     requestedPayChannel: initialPayChannel,
   });
-  const phDefaultPayChannelAppliedRef = useRef(false);
   const {
     payment,
     paymentDispatch,
@@ -74,7 +71,7 @@ export function SubscriptionScreen({
     shouldResumePendingOrder,
     returnTo,
     characterSlug,
-    initialPayChannel: resolvedInitialPayChannel,
+    initialPayChannel: paymentMethodConfig.initialPayChannel,
   });
   const canSubscribeVip = subscriptionType === "vip";
   const analyticsContext =
@@ -134,35 +131,20 @@ export function SubscriptionScreen({
     paymentDispatch({ type: "PaymentPlanSelected", planId });
   };
 
-  useEffect(() => {
-    if (isPaymentBusy) return;
-
-    if (!canChoosePaymentMethod) {
-      if (payment.payChannel === "stripe") return;
-      paymentDispatch({
-        type: "PaymentPayChannelChanged",
-        payChannel: "stripe",
-      });
-      return;
-    }
-
-    if (initialPayChannel !== null) return;
-    if (phDefaultPayChannelAppliedRef.current) return;
-    phDefaultPayChannelAppliedRef.current = true;
-
-    if (payment.payChannel === resolvedInitialPayChannel) return;
+  const handlePaymentMethodChange = (payChannel: PayChannel) => {
     paymentDispatch({
       type: "PaymentPayChannelChanged",
-      payChannel: resolvedInitialPayChannel,
+      payChannel,
     });
-  }, [
-    canChoosePaymentMethod,
-    initialPayChannel,
+  };
+
+  usePaymentMethodSelection({
+    config: paymentMethodConfig,
+    currentPayChannel: payment.payChannel,
     isPaymentBusy,
-    payment.payChannel,
-    paymentDispatch,
-    resolvedInitialPayChannel,
-  ]);
+    requestedPayChannel: initialPayChannel,
+    onChange: handlePaymentMethodChange,
+  });
 
   useEffect(() => {
     const defaultPlanId = getDefaultSubscriptionPlanId({
@@ -242,19 +224,15 @@ export function SubscriptionScreen({
           />
         </div>
 
-        {canChoosePaymentMethod ? (
+        {paymentMethodConfig.canChoosePaymentMethod ? (
           <section className={styles.paymentMethodSlot}>
-            <SubscriptionPaymentMethod
+            <PaymentMethodSelector
               value={payment.payChannel}
-              defaultChannel={resolvedInitialPayChannel}
+              defaultChannel={paymentMethodConfig.initialPayChannel}
               disabled={isPaymentBusy}
               caption="GCash by default in the Philippines"
-              onChange={(payChannel) => {
-                paymentDispatch({
-                  type: "PaymentPayChannelChanged",
-                  payChannel,
-                });
-              }}
+              analyticsKey="subscription.payment_method"
+              onChange={handlePaymentMethodChange}
             />
           </section>
         ) : null}

src/app/tip/tip-screen.module.css

@@ -57,6 +57,7 @@
 .header,
 .hero,
 .productCard,
+.paymentMethodSlot,
 .statusMessage,
 .successCard,
 .checkoutSlot {
@@ -407,6 +408,10 @@
   text-align: center;
 }
 
+.paymentMethodSlot {
+  margin-top: clamp(18px, 5.185vw, 28px);
+}
+
 .successCard {
   justify-content: flex-start;
   border-color: rgba(255, 84, 135, 0.16);

src/app/tip/tip-screen.tsx

@@ -6,6 +6,8 @@ import { ArrowLeft, Heart, Sparkles } from "lucide-react";
 
 import { CharacterAvatar } from "@/app/_components";
 import { MobileShell } from "@/app/_components/core";
+import { PaymentMethodSelector } from "@/app/_components/payment/payment-method-selector";
+import { usePaymentMethodSelection } from "@/app/_hooks/use-payment-method-selection";
 import { usePaymentPlanAnalytics } from "@/app/_hooks/use-payment-plan-analytics";
 import { usePaymentRouteFlow } from "@/app/_hooks/use-payment-route-flow";
 import type { PayChannel } from "@/data/schemas/payment";
@@ -13,6 +15,7 @@ import {
   behaviorAnalytics,
   type PaymentAnalyticsContext,
 } from "@/lib/analytics";
+import { getPaymentMethodConfig } from "@/lib/payment/payment_method";
 import {
   buildTipCoffeePath,
   DEFAULT_TIP_COFFEE_TYPE,
@@ -26,6 +29,7 @@ import {
   useActiveCharacterRoutes,
 } from "@/providers/character-provider";
 import { useAuthState } from "@/stores/auth/auth-context";
+import { useUserState } from "@/stores/user/user-context";
 
 import { TipCheckoutButton } from "./tip-checkout-button";
 import {
@@ -59,6 +63,11 @@ export function TipScreen({
   const character = useActiveCharacter();
   const characterRoutes = useActiveCharacterRoutes();
   const authState = useAuthState();
+  const userState = useUserState();
+  const paymentMethodConfig = getPaymentMethodConfig({
+    countryCode: userState.currentUser?.countryCode,
+    requestedPayChannel: initialPayChannel,
+  });
   const [selectedCoffeeType, setSelectedCoffeeType] =
     useState<TipCoffeeType>(coffeeType);
   const coffeeOption = getTipCoffeeOption(selectedCoffeeType);
@@ -66,11 +75,9 @@ export function TipScreen({
     selectedCoffeeType,
     characterRoutes.tip,
   );
-  const resolvedInitialPayChannel =
-    initialPayChannel ?? navigator.getDefaultPayChannel();
   const { payment, paymentDispatch } = usePaymentRouteFlow({
     catalog: "tip",
-    initialPayChannel: resolvedInitialPayChannel,
+    initialPayChannel: paymentMethodConfig.initialPayChannel,
     paymentType: "tip",
     shouldResumePendingOrder,
   });
@@ -120,6 +127,21 @@ export function TipScreen({
     payment.status !== "ready" || payment.isLoadingPlans || isPaymentBusy;
   const isAuthLoading = !authState.hasInitialized || authState.isLoading;
 
+  const handlePaymentMethodChange = (payChannel: PayChannel) => {
+    paymentDispatch({
+      type: "PaymentPayChannelChanged",
+      payChannel,
+    });
+  };
+
+  usePaymentMethodSelection({
+    config: paymentMethodConfig,
+    currentPayChannel: payment.payChannel,
+    isPaymentBusy,
+    requestedPayChannel: initialPayChannel,
+    onChange: handlePaymentMethodChange,
+  });
+
   useEffect(() => {
     if (payment.isLoadingPlans || payment.isCreatingOrder || payment.isPollingOrder) {
       return;
@@ -270,6 +292,19 @@ export function TipScreen({
           />
         </section>
 
+        {paymentMethodConfig.canChoosePaymentMethod ? (
+          <section className={styles.paymentMethodSlot}>
+            <PaymentMethodSelector
+              value={payment.payChannel}
+              defaultChannel={paymentMethodConfig.initialPayChannel}
+              disabled={isPaymentBusy}
+              caption="GCash by default in the Philippines"
+              analyticsKey="tip.payment_method"
+              onChange={handlePaymentMethodChange}
+            />
+          </section>
+        ) : null}
+
         {showMissingPlan ? (
           <p className={styles.statusMessage} role="alert">
             Coffee tip is not available yet. Please try again later.

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

@@ -0,0 +1,65 @@
+import { afterEach, describe, expect, it, vi } from "vitest";
+
+import { getDefaultPayChannelForCountryCode } from "../default_pay_channel";
+import {
+  canChoosePayChannel,
+  getPaymentMethodConfig,
+  resolvePayChannel,
+} from "../payment_method";
+
+describe("payment method rules", () => {
+  afterEach(() => {
+    vi.unstubAllEnvs();
+  });
+
+  it("defaults Philippines users to GCash and other countries to Stripe", () => {
+    expect(getDefaultPayChannelForCountryCode("PH")).toBe("ezpay");
+    expect(getDefaultPayChannelForCountryCode("ph")).toBe("ezpay");
+    expect(getDefaultPayChannelForCountryCode("HK")).toBe("stripe");
+    expect(getDefaultPayChannelForCountryCode(null)).toBe("stripe");
+  });
+
+  it("only allows Philippines users to choose in production", () => {
+    vi.stubEnv("NEXT_PUBLIC_APP_ENV", "production");
+
+    expect(canChoosePayChannel("PH")).toBe(true);
+    expect(canChoosePayChannel("ph")).toBe(true);
+    expect(canChoosePayChannel("HK")).toBe(false);
+    expect(canChoosePayChannel(null)).toBe(false);
+    expect(
+      getPaymentMethodConfig({
+        countryCode: null,
+        requestedPayChannel: "ezpay",
+      }),
+    ).toEqual({
+      canChoosePaymentMethod: false,
+      initialPayChannel: "stripe",
+    });
+  });
+
+  it("resolves requested and default channels for Philippines", () => {
+    vi.stubEnv("NEXT_PUBLIC_APP_ENV", "production");
+
+    expect(
+      resolvePayChannel({ countryCode: "PH", requestedPayChannel: null }),
+    ).toBe("ezpay");
+    expect(
+      resolvePayChannel({
+        countryCode: "PH",
+        requestedPayChannel: "stripe",
+      }),
+    ).toBe("stripe");
+  });
+
+  it("allows every user and keeps the requested channel outside production", () => {
+    vi.stubEnv("NEXT_PUBLIC_APP_ENV", "test");
+
+    expect(canChoosePayChannel(null)).toBe(true);
+    expect(
+      resolvePayChannel({
+        countryCode: "HK",
+        requestedPayChannel: "ezpay",
+      }),
+    ).toBe("ezpay");
+  });
+});

src/lib/payment/payment_method.ts

@@ -0,0 +1,37 @@
+import type { PayChannel } from "@/data/schemas/payment";
+import { AppEnvUtil } from "@/utils/app-env";
+
+import { getDefaultPayChannelForCountryCode } from "./default_pay_channel";
+
+export interface PaymentMethodConfig {
+  canChoosePaymentMethod: boolean;
+  initialPayChannel: PayChannel;
+}
+
+export function canChoosePayChannel(
+  countryCode: string | null | undefined,
+): boolean {
+  if (!AppEnvUtil.isProduction()) return true;
+  return countryCode?.trim().toUpperCase() === "PH";
+}
+
+export function resolvePayChannel(input: {
+  countryCode: string | null | undefined;
+  requestedPayChannel: PayChannel | null | undefined;
+}): PayChannel {
+  if (!canChoosePayChannel(input.countryCode)) return "stripe";
+  return (
+    input.requestedPayChannel ??
+    getDefaultPayChannelForCountryCode(input.countryCode)
+  );
+}
+
+export function getPaymentMethodConfig(input: {
+  countryCode: string | null | undefined;
+  requestedPayChannel: PayChannel | null | undefined;
+}): PaymentMethodConfig {
+  return {
+    canChoosePaymentMethod: canChoosePayChannel(input.countryCode),
+    initialPayChannel: resolvePayChannel(input),
+  };
+}