1. Configure a new project in the Google Developer Console: https://console.developers.google.com
2. Enable the following APIs:

   Analytics API

   Contacts API

   Google+ API

3. Create a new OAuth-2.0-Client-ID for a Webapplication
4. Use Client-ID and Clientkey to configure the Google Analytics Channel in CampaignChain

Hint: Your Client-ID should look like whatever.apps.googleusercontent.com.