In the Google API Console - https://code.google.com/apis/console/:

1. Create a Project
2. In Services, enable Google+ API
3. In API Access for your project, create a Client ID. Set the Authorized Redirect URIs to "http://mydomain.com/google/callback/" and Authorized Javascript Origins to your domain.

You need to set the following in your settings.py

• DOMAIN
• GOOGLE_API_KEY, GOOGLE_CLIENT_ID and GOOGLE_CLIENT_SECRET - get the values at the Google API Console: https://code.google.com/apis/console/