Currently 19Site is working on a project need to integrate with Google GSuite. This post is for saving some usable link of documentation.

### OAuth2 Service Account

https://developers.google.com/identity/protocols/OAuth2ServiceAccount

### Google OAuth2 scope list

https://developers.google.com/identity/protocols/googlescopes

### Directory API (Admin SDK)

https://developers.google.com/admin-sdk/directory/v1/guides/authorizing

### Calendar API v3 reference

https://developers.google.com/calendar/v3/reference