1. Visit Google Developers
  2. Create a new app and fill all the required fields
  3. Enable Google+ API.
  4. Go to the Credentials tab, create credential (OAuth client ID) and choose web application, docsLhttps://developers.google.com/identity/protocols/oauth2/native-app#creatingcred
  5. Important: In Authorized redirect, URIs insert the return URL for your app. Ex: http://mydomin.com/index.php/account/loginGoogle?authclient=google
  6. then copy Client id and Client secret to EasyAds admin -> settings -> general -> API keys -> Google app id and Google app secret

  7. Go to the OAuth tab and add the URL of your website.
  8. Click Save, now you can use Google login in your app.

Note: It may take up to 5 minutes for Google settings to take effect