A "Google App ID" and "Secret Key" is required when you decide to Login through Google Account.
1. Create project at https://console.developers.google.com/project.
2. Enter the Project name.
3. Please enable the Google+ API under APIs
4. Go to the APIs & auth-> Credentials.
5. Click on the “Create new client ID” button.
6. In the dialog choose the Application type: Web application.
7. Enter the Authorized JavaScript origins: Enter the Domain Name where you are using Yendif Login Module.
8. Enter the Authorized redirect URI: Enter the exact URL of your site where the Yendif Login module enabled.
9. And press the “Create client ID” button.
10. Copy the Client ID for web application and Client secret.
11. Finally, enter the Client ID and Client Secret in "Extensione=> Module Manager => Yendif Login => Google Options"