The deal request.

The request failed validation; message names the problem — e.g. takeRate is a decimal fraction; expected 0 ≤ x ≤ 0.85. See the Errors guide.

The API key was missing or not accepted. Not JSON — a bare text/plain string: api key not provided, invalid api key, or invalid api key syntax.

The key is valid but not permitted: {"message": "Partner not authorized for this API"} or {"message": "Insufficient scope"}. Checked before body validation — even with ?dryRun=true.

No deal request with that id exists for your account: {"message": "Deal request not found"}.