webhook / retry / idempotency / local-only
Review retries, duplicates, and idempotency
Compare event id, retry, and idempotency key with synthetic deliveries. Nothing is sent to a receiver and no real data is stored.
Fixed delivery examples
| Case | Event id | Retry | Idempotency key | Decision |
|---|---|---|---|---|
| Initial | evt_100 | 0 | pay_100 | Process |
| Retry | evt_100 | 1 | pay_100 | Ignore duplicate |
| New delivery | evt_101 | 0 | pay_101 | Process separately |
| Out of order | evt_099 | 1 | pay_099 | Recheck state |
| Expired | evt_098 | 2 | pay_098 | Do not reprocess blindly |
Review synthetic examples locally.
Keep these values separate
- Event id identifies a delivery.
- Retry is a resend count, not proof of success.
- Idempotency key defines the once-only processing boundary.
- Out-of-order and expired deliveries should not be treated as success from dedupe alone.