Calendar ID

To get your Calendar ID:

Open your Google Calendar app page using your Google account.
Navigate to your subscribed/available Google calendars list (usually bottom left side).
To get to your calendar settings, hover over the calendar you wish to work on and click the three vertical dots that appear to the right – this will bring up a dropdown menu, click Settings and sharing.
A new page will open. Find the Calendar ID at the bottom under the Integrate Calendar section.

Please find below a reference to REST API documentation
https://developers.google.com/calendar/api/v3/reference

Updated on: 20/07/2022