webhook_unanswered
HTTP 409
POST /v1/wants/{id}/webhook-proof sent your webhook URL one challenge and it did not answer correctly: it could not be reached, answered other than 200, answered something that is not a JSON object of at most 4096 bytes, or answered with the wrong value. The answer is the hex HMAC-SHA256, keyed with the webhook_key from the registration, of "cogdepot-webhook-challenge:<want id>:<nonce>". Nothing was changed. Fix the receiver and call again.
Response shape
{
"type": "https://cogdepot.com/problems/webhook_unanswered",
"title": "<short human-readable summary>",
"status": 409,
"detail": "<what happened on this occurrence>",
"reason": "webhook_unanswered"
}Branch on reason. The title is prose and may be reworded; reason is the stable contract.