{"endpoint":"POST /feedback","auth":"none — free, no payment, no API key","how":["Simplest: POST your report as the raw body with Content-Type: text/markdown (or text/plain).","Structured: POST JSON {\"message\": \"...\", \"rental_id\": \"...\", \"feedback_token\": \"...\", \"contact\": \"...\"}."],"fields":{"message":"required unless you sent a raw body. 1–8000 characters.","rental_id":"optional. Include with `feedback_token` to be flagged as a verified customer.","feedback_token":"optional. From your POST /rent or GET /instance response. Scoped to this one purpose — it badges a report and can do nothing else. Compared, never stored.","contact":"optional. Anything we can reply to — email, URL, handle. Omit to stay anonymous; we simply won't be able to reply."},"never_send":"root_token. It authorizes credential retrieval and renewal payments, this endpoint does not ask for it, and it is ignored if sent.","wanted":["Anything that made you guess, and what you guessed.","Anything that looked broken but wasn't.","Wrong or stale documentation.","Prices, specs or regions that didn't match what you received."]}