OPDC API error code

REQUESTED_PRICE_MISMATCH

HTTP status 422

A prime line's requested price disagrees with the price its estimate and markups give. 422. Nothing is written.

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

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