title: Firebase Notifications: Easiest way to implement opt-out
body: <p><a href="https://firebase.google.com/docs/notifications/" rel="nofollow">Firebase notifications</a> are convenient because they require virtually zero code to implement in an Android app and can be sent from the web console.</p>
  
  <p>However, what's the best way to implement an opt-out feature, so that users can choose to <strong>not</strong> receive push notifications? </p>