Better, you can authenticate to your google account then get the token to use.
To make the Oaut connexion you can follow this well made instruction by @mebeingken
Google Calendar API use case - Need help / Plugins - Bubble Forum
And call
https://www.googleapis.com/auth/cloud-platform
instead of contact
here the link for launching the connector
https://accounts.google.com/o/oauth2/v2/auth?access_type=offline&response_type=code&scope=https://www.googleapis.com/auth/cloud-platform&client_id=“yourappID”&redirect_uri=“yourURI”