Mobile Payments Integration: Stripe, Apple Pay, and Google Pay in Your App

Adding payments to a mobile app is one of the most consequential engineering decisions you'll make. The payment flow determines conversion rates, fraud exposure, PCI compliance scope, and how much of the revenue stack you control. Getting it right takes more than dropping in an SDK — it requires thinking through the full transaction lifecycle from tap to payout.

Choosing a Payment Processor

For most mobile apps in 2026, Stripe is the default choice and for good reason: mature mobile SDKs (Stripe iOS and Android, plus react-native-stripe-sdk for React Native), strong documentation, flexible APIs, and a built-in fraud layer. Alternatives worth considering:

• Braintree (PayPal) — Good if PayPal wallet support is important for your audience
• Square — Best fit for businesses with physical POS alongside mobile
• Adyen — Enterprise-grade, global market support, higher minimum volume expectations
• Chargebee / Recurly — Subscription billing with payment processor integrations, not processors themselves

For most apps, start with Stripe and evaluate alternatives only when you have specific requirements (international payment methods, marketplace splits, high-volume pricing) that Stripe doesn't handle well at your scale.

Apple Pay and Google Pay: Native Wallets First

The highest-converting payment flow on mobile is native wallet payment — Apple Pay on iOS, Google Pay on Android. No card number entry, no form friction, biometric authorization in one step. Conversion rates for native wallet payments are typically 30–50% higher than typed card entry for new users.

Implementing Apple Pay

Apple Pay requires a few layers:

1. Apple Merchant ID — registered in the Apple Developer portal
2. Domain verification — for web payments; for native app payments, this is handled by provisioning profile
3. Payment processing certificate — used to encrypt payment data between Apple and your payment processor
4. Stripe integration — Stripe handles the decryption and tokenization via its Apple Pay support, so you don't need to manage certificates manually if using Stripe

In code, you present a PKPaymentAuthorizationViewController (native) or use Stripe's PaymentSheet which handles Apple Pay natively. Always check PKPaymentAuthorizationController.canMakePayments() before showing the button — not all devices or accounts support it.

Implementing Google Pay

Google Pay uses the Google Pay API, which in React Native is accessible via @google-pay/button-react-native or through Stripe's useGooglePay hook. Key steps:

1. Register your app in the Google Pay Business Console
2. Integrate the Google Pay API with your payment processor
3. Use isReadyToPay() to conditionally render the button
4. Handle the payment token response and charge server-side

Card Entry and the Payment Sheet Pattern

For users who don't have a native wallet configured, card entry is the fallback. The current best practice is the Payment Sheet pattern rather than building custom card input UI:

• Stripe's PaymentSheet handles all card input, validation, 3D Secure, and saved payment methods in a pre-built, PCI-compliant sheet
• You never touch raw card numbers — they go directly to Stripe's SDK, keeping you out of PCI scope for cardholder data
• The sheet handles Apple Pay and Google Pay too, giving you a unified payment UI

Custom card input UI increases PCI scope significantly and rarely improves conversion enough to justify the compliance and security overhead.

The Backend: Payment Intents and Webhooks

All payment processing logic belongs on the server, not the mobile client. The standard flow:

1. Mobile client requests a PaymentIntent from your backend (never create these client-side)
2. Backend creates the PaymentIntent with amount, currency, and metadata, returns the client secret to the app
3. App uses the client secret to confirm the payment via the Stripe SDK
4. Stripe sends a webhook event to your backend confirming the payment succeeded or failed
5. Backend updates order/subscription state based on the webhook — never trust client-side confirmation alone

Webhooks are non-negotiable. Client-side confirmation can be spoofed or interrupted. Webhooks are Stripe's authoritative notification that money moved.

Subscriptions in Mobile Apps

Subscription billing in mobile apps has two paths, and the choice matters for revenue share:

• In-app purchases (Apple/Google billing) — 15–30% platform fee, required for content/digital goods consumed in-app per App Store rules
• External payment processor (Stripe) — No platform fee, allowed for SaaS apps and services not consumed in-app. Apple's external purchase entitlement rules apply in the US following App Store legal rulings.

Evaluate carefully. For SaaS and B2B apps, Stripe subscriptions almost always make more financial sense. For consumer media apps, Apple/Google in-app purchases may be required.

FAQ

Do I need PCI compliance certification for a mobile app using Stripe?

Using Stripe's SDK and Payment Sheet puts you in the SAQ A tier of PCI compliance — the lowest scope, requiring a self-assessment questionnaire rather than a full audit. You should still complete the SAQ A, but you don't need a QSA-certified audit.

Can I save payment methods for returning users?

Yes, via Stripe Customers and SetupIntents. Store the Customer ID in your backend associated with the user account. Never store card numbers — only Stripe payment method tokens.

What's the best way to handle failed payments in a subscription?

Stripe's Smart Retries handles automatic retry logic. Supplement with dunning emails triggered by the invoice.payment_failed webhook and a grace period before cancellation. Give users a way to update their payment method via a customer portal or in-app flow.

Should I implement Apple Pay even if it reduces checkout to one tap?

Absolutely. One-tap checkout is the goal. The small implementation effort for Apple Pay pays back in conversion rates within the first week.