title: Receive push notifications on one android app from two Firebase projects
body: <p>I have an Android app, and I want it be able to receive push notifications from two different Firebase projects.
  <br><br>
  I read the blog "Working with multiple Firebase projects in an Android app" <a href="https://firebase.googleblog.com/2016/12/working-with-multiple-firebase-projects-in-an-android-app.html" rel="noreferrer">https://firebase.googleblog.com/2016/12/working-with-multiple-firebase-projects-in-an-android-app.html</a> which talks about "Accessing the Databases from two different Firebase projects".<br>
  However, there is no info about receiving notifications from multiple Firebase projects.
  <br><br>
  So, how to integrate my app with multiple Firebase projects and receive push notifications from them?</p>