OPDC API error code

IDEMPOTENCY_KEY_INVALID

HTTP status 400

Idempotency-Key empty, over 128 characters, or carrying non-printable characters. 400.

The API answers with a problem document (RFC 9457) whose type is https://twinn.engineering/errors/idempotency-key-invalid, and with X-Error-Code: IDEMPOTENCY_KEY_INVALID. Branch on the code, never on the detail text.

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