OPDC API error code

SECOND_PAYEE_UNSUPPORTED

HTTP status 422

A payment names an invoice with a second payee (a two-party check). 422. Nothing is written.

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

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