2 min read
Verify1
Ack fast2
Dedupe + reconcile3 & 4
The four properties
- Verify — HMAC over the raw body, fresh timestamp. See signature verification.
- Acknowledge fast —
200within the 10-second timeout; process asynchronously. - Deduplicate — on the event id, because delivery is at-least-once. See idempotent handlers.
- Reconcile — treat events as unordered; trust
createdand live state.
Put together
The verify-then-enqueue pattern satisfies all four cleanly: verify and enqueue synchronously (fast ack), then dedupe and reconcile in the worker. It is the shape to reach for at any real volume.
Frequently asked questions
Which property is most often skipped?
Idempotency. Teams verify and ack correctly, then process an event twice on a redelivery. Dedupe on the event id from day one.
Do I need all four for a simple integration?
Verify and ack are non-negotiable. Dedupe and reconcile matter the moment an event has a side effect you would not want applied twice or out of order — which is almost always.
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