Hello, I don't quite understand the webhook flow

API
3

Thanks for the help!
I managed to receive the notifications.

How do I identify the channel from an Offline notification?
The only identification I could find is the “user_id” in the property Link in headers.

 headers:
   { 
     Link:
      '<https://api.twitch.tv/helix/webhooks/hub>; rel="hub", <https://api.twitch.tv/helix/streams?user_id=527735084>; rel="self"',
     'Twitch-Notification-Id': 'da2cabdb-daa4-44c1-afe8-51f8b8a412ae',
},