The current method seems to require opening up to the public a URL from which to receive a push notification: https://developers.google.com/calendar/v3/push
Other Google technologies, like gmail (https://developers.google.com/gmail/api/reference/rest/v1/users/watch) works that we can specify a PubSub topic and then just subscribe.
This doesn't require me to open up a port externally, and also make easier localhost testing.
- Is there any way to have a similar "PubSub to a topic" approach?
- Is there any way to simplify localhost testing?