Here are the steps to configure GCM notifications for Android

Registering with Google Cloud Messaging

1. Goto Google APIs Console pageand create a new project. (If you haven’t created already otherwise it will take you to dashboard)
   
   
   
   
   
2. Create Project
    
   
   
3. After creating project you can see the project number. Note down the project id which will be used as SENDER ID in android project 
   
   

   

4. After that click on services of the left panel and turn on Google Cloud Messaging for Android.
   
   

   

5. Once you have done, Click on API access and note down the API key. This API key will be used when sending request to GCM server. 
   
   

6. Create new server Key
   

Note: Once your GCM key is vreated, you'll have to share it with us through a private support ticket. We will incorporate it in your custom build after that.