- Go to https://code.google.com/apis/console/ and create a new project.

- Add your Project name.

- Click on "Credentials" from the left side menu then click on "OAuth consent screen" tab.

- Fill "Product name shown to users", "Privacy policy URL" and "Terms of service URL" fields

- Click on "Save" button after that you will be redirect to another page.

- Select "Web Application" under "Application type"

- Scroll down and fill "Authorized redirect URIs" with http://yourdomain.com/social-auth/callback/google/ and make sure to replace "yourdomain.com" with your actual domain.

- Click on "Create" button

- Then you will get your "Client ID" and "Client Secret"

- Click on "Library" from the left side menu then search for "Google+ API" and click on it.

- Beside "Google+ API" click on "ENABLE"

- That's it.