2009: Idempotency conflict.
This Idempotency-Key was already used with a different request.
HTTP status: 409.
The key is bound to an earlier request whose body differs from this one, so the reuse is refused rather than replayed. Nothing new was recorded.
Troubleshooting
Section titled “Troubleshooting”- Use a fresh Idempotency-Key for a new operation.
- Replay the same Idempotency-Key with an identical body to read the original outcome instead of guessing.