Integration of any service is very simple. So, you can read about Facebook, first, then look to screenshots and everything must be clear.
1. Go to https://code.google.com/apis/console/ and create a new project.
2. Go to API Access under API Project. After that click on Create an OAuth 2.0 client ID to create a new application.
3. A pop-up named "Create Client ID" will appear, fill out any required fields such as the application name and description.
4. Click on Next.
5. On the popup set Application type to Web application and switch to advanced settings by clicking on (more options).
6. Provide this URL as the Callback URL for your application: http://example.com/assets/components/hybridauth/action.php?hauth.done=Google