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INVALID_FEEDBACK_KEY

The feedback key in the webhook URL is unknown

The fb_ key in a bounce webhook URL does not exist or was rotated.

http status
401
credits
Nothing is billed for a failed request.

What it means

Bounce webhooks authenticate through the key embedded in their URL, since sending providers cannot add custom headers. Rotating the key on the API keys page invalidates every URL that carried the old one.

What to do

Generate or reveal the current key on the API keys page and update the webhook URL at your sending provider.

Example response 

{
    "success": false,
    "error": {
        "code": "INVALID_FEEDBACK_KEY",
        "message": "That feedback key does not exist or was rotated.",
        "request_id": "req_01m1kgdm4xngzmbmff68g94w0c"
    }
}

Every error carries the request_id also sent in the X-Request-Id header; quote it when writing to support.

Related

markdown version: /docs/errors/INVALID_FEEDBACK_KEY.md