Error codes
idempotency_conflict
HTTP status: 409
What happened
The same Idempotency-Key was used with a different request within 24 h, or an identical
request with that key is still in progress. A different API key mode (test or live) counts as
a different request.
How to fix
Use a new key for a new request. Reuse a key only to retry the identical request with a key of the same mode.
Source: docs/errors/idempotency_conflict.md.