Access to BigQuery | Token

[MariaD]

Hi folks, 

We're using SAS Access to BigQuery for the first time on our SAS 9.4M7 environment. As an authentication method, we use the service account. In this kind of connection, does SAS use any token to communicate with BQ, or token are used exclusively with OAuth authentication?

In case use a token, with a service account, where find information about the type of token used? 

Regards,