IDEMPOTENCY_KEY_REUSED
409invalid_requestThe Idempotency-Key was reused with different parameters.
Cause
Replaying the key would silently change what the original request meant, so it is refused.
How to fix it
Use a fresh key for the new parameters, or resend the original body to replay the stored result.
Example response
409 IDEMPOTENCY_KEY_REUSED
JSON
{
"error_code": "IDEMPOTENCY_KEY_REUSED",
"error_type": "invalid_request",
"error_message": "The Idempotency-Key was reused with different parameters.",
"hint": "Use a fresh key for the new parameters, or resend the original body to replay the stored result.",
"docs_url": "https://docs.billerapi.com/errors/IDEMPOTENCY_KEY_REUSED",
"request_id": "d94f5e2a-8c3b-4f1e-9a7d-6b2c1e0f8a34"
}Related
- Error handling — the error envelope shape and how to parse it
- Error code reference — every stable error code
Canonical docs URL: https://docs.billerapi.com/errors/IDEMPOTENCY_KEY_REUSED
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