Make your webhook integrations actually reliable

Make your webhook integrations actually reliable
The hardening checklist for the duct tape holding your stack together.

1 — Verify the signature on every incoming webhook before you process it.
Why: an unsigned endpoint is a public write API anyone can spoof.

2 — Return 200 immediately, then process async from a queue.
Why: slow handlers trigger sender retries, and retries trigger duplicate processing.

3 — Make every handler idempotent by deduping on the event ID.
Why: at-least-once delivery means you will receive the same event twice; plan for it.

4 — Set up a dead-letter queue for failures, not a silent catch.
Why: the integration that 'just stopped working' is usually failures nobody logged.

5 — Alert on zero events received, not just on errors.
Why: a webhook that goes quiet looks healthy until you notice the missing data.

That's the stack for this week. Forward to a teammate.