You only need one type of Authentication, either OAuth Authentication [best suited for individual users] or Service Account Authentication [best suited for organizations].
Oauth Authentication
Authenticate with Oauth Account.
Service Account Authentication
Authenticate with Service Account.
Connect to Google Integration and ingest data:
Once you have setup the authentication keys and have started the application, you will see your application running in the browser.- Once you login with your google account successfully, this screen will appear :

- On the left you will find a
plugicon. That’s our connector.

- Now depending on which authentication key you have configured, you can choose ingestion using
Oauth Accountor ingest usingService Account.