Testing Webhooks: The Pattern I Keep Reaching For

Short summary

Separate webhook reception (HTTP validation and queueing) from business logic processing to enable deterministic testing. This pattern eliminates timing dependencies, ngrok overhead, and sleep() calls while reliably testing signature verification, retries, out-of-order delivery, and duplicates in CI and production.

• •Split webhook receiver into three stages: accept HTTP, validate signature, queue for processing
• •Test each stage independently to eliminate timing issues and flaky tests
• •Handle signature verification, retries, out-of-order delivery, and idempotency as separate test cases

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