Go4Clients Form Notifications  add-on will store the form owner gmail account in Google SQL Databases to manage the add-on

Viewing and managing your forms in Google Drive:
 

To send notifications when a form response is received, the Go4Clients Form Notifications add-on™ requires access to your Google Forms, including the ability to read the form fields and response data, to send email messages.

Connecting to an external service:
 

The add-on establishes connections to the licensing server to authenticate your license and provide advanced features for subscribed users.

 

Sending email as you:
 

The primary function of the Go4Clients Form Notifications add-on™ is to send emails, so it requires permissions to send emails on your behalf.

Allowing the application to run when you are not present:
 

The add-on establishes a form submit trigger that sends an email once a new form is submitted, even if you are not signed in to your Google account, and this occurs in the background.