This endpoint should never be accessed directly by clients, it is only ever used during the google oauth process during oauth.
Initially setup the calendar, create rezi calendar, copy upto 16 days prior into calendar, create a subscription channel for the callback.
Trigger a call to your callback url related to this project..
Upon the receipt of an event, send a response in an async way to the event framework of Manufacturing Network. In the callback message, be sure to include the event ID. Add other information as appropriate.