Security
Webhook endpoints are unauthenticated HTTP endpoints that receive data from external services. They're a common target for attacks — and most security issues stem from missing a few basic checks. This checklist covers 12 security tests every webhook implementation should pass. 1. Signature Verification Is Enforced Risk: Anyone who
Testing
Webhook failures in CI are some of the most frustrating bugs to debug. The test passes locally but fails in CI. The webhook arrives but nothing happens. Logs show 200 OK but the feature doesn't work. This guide gives you a systematic approach for diagnosing and fixing webhook
Testing
Event-driven systems are powerful and notoriously difficult to test. A webhook arrives, triggers a queue message, which triggers a downstream service, which emits another event. By the time something goes wrong, the failure is three hops away from the original trigger. This guide covers practical strategies for testing event-
Testing
Webhook providers retry failed deliveries. Your handler will receive duplicate events. Testing retry behavior — and ensuring your handler survives it — is as important as testing the happy path. This guide covers testing webhook retry logic from both sides: testing your handler's idempotency under retries, and testing your own
Testing
Webhook signature verification is the one security control standing between your server and arbitrary POST requests. If you're not testing it, you're trusting that your implementation is correct — which is how security bugs get shipped. This guide covers how to test HMAC and JWT signature verification
Testing
Webhooks are notoriously hard to test. They arrive asynchronously, carry cryptographic signatures, and the service sending them is usually not your code. Mock servers solve this by letting you simulate incoming webhook events locally — without waiting for real events from Stripe, GitHub, or Shopify. This guide shows how to set