Firebase Cloud Messaging notification from Java instead of Firebase Console

Question

I am new to Firebase and I am running into errors such as mismatch sender id and Authentication Error with HTTP status 401 when my Java application tries to send a notificat

Answer 1

On:

// Obtain serverKey from Project Settings -> Cloud Messaging tab // for "My Notification Server" project in Firebase Console. String serverKey = ;

You must obtain the key for your android app.

And thank you, I was struggling to build a service to send/receive notifications for the app. Saw your question, tried to get it right, and used to build mine. Hope this will help you :)