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Build mobile-payment tests in layers: use deterministic app tests for interface and state logic, provider sandboxes for processor scenarios, and a separate device-and-wallet matrix for Apple Pay and Google Pay. Use scenario-specific test values and verify the final transaction state; a single successful test card cannot cover declines, authentication, interruptions, or wallet restrictions.
Choose the test layer that matches the behavior
Payment tests answer different questions, so keep app behavior separate from provider and wallet behavior. A stubbed result can make UI tests repeatable without a network dependency; a provider sandbox checks the processor integration; device and wallet tests cover platform-specific configuration and restrictions.
| Test layer | What it verifies | What it does not establish |
|---|---|---|
| Unit and UI tests with stubbed results | Cart totals, validation, button and loading states, cancellation, error presentation, and retry behavior. | That the provider accepts a request or a wallet is provisioned correctly. |
| Provider sandbox integration tests | Provider-specific authorization, decline, authentication, and supported interruption scenarios, plus the resulting transaction state. | That production wallet provisioning or settlement will behave identically. |
| Wallet and device verification | The configured platform wallet path on a supported device, account, and region, subject to the provider’s test/live rules. | That typed-card test values exercise the wallet flow. |
Build app-level tests that stay deterministic
Stub the payment result when testing application logic. This keeps routine tests from depending on network availability or sandbox behavior, and lets the suite deliberately cover user-visible states.
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- Check cart totals and input validation before payment submission.
- Verify loading and button states while a request is pending.
- Exercise cancellation, clear error presentation, and retry behavior.
- Test duplicate taps and retries in controlled conditions, and confirm the UI and backend do not disagree about the payment outcome.
Use provider sandboxes for processor scenarios
Provider test values are environment-specific and scenario-specific. Keep a provider-owned mapping next to the integration tests so a success value is not mistakenly used to test a decline or authentication challenge. Stripe documents test values for simulating successes, declines, disputes, refunds, and authentication; consult its test-mode guidance for the current scenarios. Stripe also warns that testing environments may be rate-limited and are not intended for load testing.
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For each supported scenario, assert the provider result and the server-side state your app relies on—not only a toast, button change, or redirect. Include success, decline, authentication or challenge, invalid input, and timeout or connectivity interruption where the provider’s test path supports them. Adyen’s integration testing guidance recommends testing timeouts, connection problems, transaction status, simulated declines, and cardholder verification methods.
Test wallets as distinct payment paths
Wallet flows have their own configuration, eligibility, and environment rules. Record the platform, wallet, provider, device and account region, and whether the run is sandbox or live. Do not diagnose a wallet failure from typed-card test values alone.
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Apple Pay
Apple’s Apple Pay sandbox guidance calls for a sandbox tester account, a supported device, and a supported region. It says real cards must be used in production. Sandbox test transactions decline before fulfillment because the test key does not match the production key. Treat these as distinct test and production behaviors, not evidence that a sandbox success proves production readiness. Apple’s page says its card data is current as of August 2025; region and device requirements may change.
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Adyen’s Google Pay Component documentation describes a test-card suite with labeled FPAN, eligible DPAN, and 3DS2 scenarios. It also explains where to check payment status in Customer Area. Follow the documented scenario and confirm the provider-side status rather than assuming a generic card value represents every wallet case.
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Adyen POS/mobile Apple Pay scope
For the specific NFC wallet POS/mobile context covered by Adyen’s POS and mobile testing page, Apple Pay can only be tested in a live environment. This restriction applies to that documented integration context; it should not be generalized to every Apple Pay implementation.
StoreKit in-app purchases
StoreKit purchases follow Apple’s transaction lifecycle and are not external PSP card payments. In tests, inspect payment transaction observer calls and finish transactions as described in Apple’s payment request testing documentation.
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Verify state transitions and recovery
Use a shared set of expected outcomes across UI and backend checks so that pending, succeeded, failed, and canceled payments are distinguishable. For each supported scenario, decide what the user sees, what the server records, and whether another attempt is allowed. Test interruptions and retries deliberately; a transient network failure should not be confused with a confirmed decline or success.
- Compare the visible app state with the server-side payment state.
- Check pending outcomes and the provider’s final status before treating a request as complete.
- Exercise duplicate submission and retry paths without assuming a provider defect.
- Keep sandbox calls in integration tests and stubs in deterministic UI tests.
When a test card or wallet path stops working
- Confirm the app is using the intended provider account and test or sandbox credentials, not production credentials.
- Check the provider’s current scenario documentation and make sure the value matches the expected outcome; a normal success scenario will not test a decline or 3DS challenge.
- Determine whether the test is actually using a wallet. Verify the wallet’s device, account-region, configuration, and test/live requirements.
- Inspect provider-side transaction status and the app’s server-side state, not only the UI response.
- If automated tests make repeated sandbox calls, check for rate limits before interpreting failures as a reliability issue. Stripe says its test environments may be rate-limited and are not for load testing.
- Separate app logic from provider behavior: reproduce interface states with a stub, then test the processor integration with its documented sandbox scenarios.
Keep production checks controlled
When a provider’s wallet path requires live verification, separate it from automated sandbox suites and use a controlled, authorized procedure. Do not place production card details into test mode, and do not treat sandbox coverage as proof of production wallet provisioning or settlement behavior.
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