Support connecting using a Service Account
Google services, such as BigQuery procvice a Service Account capability which is the recommended method for a system-to-system integration. Using a service account means that the conenction is not tied t a specifc user's account. For example, if a user leave the company, their Google account will be terminated and then we will have to reconfigure all the contector that are using their credentials.
For more information on Google service accounts in general and for BigQuery particularly see: