Login to the Bookings App and click on (⚙️) to access the setup page.
Under Integrations, click Calendar to find the available options.
Click "Google Calendar" then "Configure Now" .
Click the "Authorize" button which will open a popup to sign into your Gmail account and "Allow" the integration.
Select the Google Calendars you would like to use to get availability from and the Google Calendar you would like to push bookings to.
Click "Proceed".