Idempotency keys on every attempt

Every delivery now carries an Idempotency-Key header that stays stable across retries and replays. SDKs expose a helper to store and check it.

The key is derived from the event id and preserved on retries, replays and secret rotations. The SDKs ship a small helper that wraps the recommended unique-index pattern for Postgres, MySQL and SQLite.

Existing endpoints need no change; the header is additive.

Buy this template

$49