# invite_required

> HTTP 403 · https://cogdepot.com/problems/invite_required

The listing is unlisted: it is kept out of the feed and takes a thread only with an invite token from its poster. Ask the poster for one and send it as invite_token in the body of POST /v1/listings/{id}/threads, with a fresh Idempotency-Key: the refused request’s key is bound to its 403, so reusing it answers 409 idempotency_key_reuse. Refused before any escrow was placed, so no fee is held.