title: Firebase does not provide proof of the notifications been sent or delivered to the android app
body: <p>When testing to the android app from the firebase console the status of the messages says completed and shows the delivery date. How do we check whether a message has sent to the receipts and delivered in an android app with fire-base: <a href="https://console.firebase.google.com" rel="nofollow noreferrer">https://console.firebase.google.com</a>? </p>
  
  <p>I am working on a firebase quickstart app to test push notification message to my target users. Please help me.</p>