I'm looking for the minimal viable set of fields that should be expected when receiving a Webmention callback. This is specifically when a callback has been sent during an outgoing Webmention request. The fields I've seen used so far were source, target and status using the values from the HTTP status code.

What I think about doing is the following:

• Using `X-Webmention-Status` to highlight the current status of the Webmention.
• Using rel="status webmention-status" in my headers and HTML to allow for the discovery of the Webmention status page
• Providing a link relation for the Webmention status page that's rendered in JSON and uses the same fields expected when informing a callback URL of the status of a Webmention to allow for pulling of that information.
• Using the fields as the body for a JSON form of the status page

POST /webmention/callback
Host: lighthouse.example

{
   "source": "http://source.example",
   "target": "http://target.example",
   "vouch": ["http://v1.com"],
   "status": 200
}

200 OK