IDEMPOTENCY_KEY_MISMATCH
409invalid_requestThe Idempotency-Key was reused with a different body.
Cause
A prior request used the same Idempotency-Key but a different request body.
How to fix it
Use a fresh Idempotency-Key for a genuinely new request, or resend the byte-identical body to replay the original response.
Example response
409 IDEMPOTENCY_KEY_MISMATCH
JSON
{
"error_code": "IDEMPOTENCY_KEY_MISMATCH",
"error_type": "invalid_request",
"error_message": "The Idempotency-Key was reused with a different body.",
"hint": "Use a fresh Idempotency-Key for a genuinely new request, or resend the byte-identical body to replay the original response.",
"docs_url": "https://docs.billerapi.com/errors/IDEMPOTENCY_KEY_MISMATCH",
"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_MISMATCH
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