Webhook

Webhooks enable real-time communication between applications. Instead of your app repeatedly checking whether something happened in an external service, the external service notifies your app when the event occurs. Common examples include payment confirmations from Stripe, push notifications from GitHub when code is pushed, and order updates from e-commerce platforms.

In vibecoded applications, webhooks are often involved in payment processing, email notifications, and third-party integrations. The AI might generate webhook handling code that works for the basic success case but fails to handle retries, verify webhook signatures, or process events that arrive out of order.

Webhook-related bugs are particularly tricky to test because they involve external services sending data to your application at unpredictable times. During QA testing, testers can trigger webhooks by performing the actions that cause them, such as making a test payment, and then verifying that the application correctly processes the resulting notification. Failures in webhook handling often manifest as features that intermittently do not work, making them frustrating for users and difficult to diagnose.