Modules
Advanced⏱ 8 min read

Payment Gateway Testing

sign in to track

Payment gateway testing validates the integration between your application and payment processors (Stripe, PayPal, Braintree, etc.). It requires testing both the happy path and an extensive range of failure and edge case scenarios that directly affect revenue.

◈Key Points

  • Use sandbox/test environments provided by all major payment gateways — never test with real cards.
  • Test all card types: Visa, Mastercard, Amex, Maestro — each can behave differently.
  • Failure scenarios: insufficient funds, expired card, invalid CVV, 3DS authentication failure, gateway timeout.
  • Currency and multi-currency scenarios: decimal handling, rounding, exchange rate application.
  • Webhook reliability: payment gateways fire webhooks for async events — test that your app handles them idempotently.
⚡ Expert Pro Tip

Every payment gateway provides a list of test card numbers that simulate specific scenarios (successful payment, declined, 3DS required). Use all of them, not just the success card.