When i try to send push notification shwoing an error


#1

when i try to send push notification using php and mysql using firebase service providers.showing an error.

The request was missing an Authentication Key (FCM Token). Please, refer to section “Authentication” of the FCM documentation, at https://firebase.google.com/docs/cloud-messaging/server.
Error 401

how can i fix it please anyone help me.


#2

Do what it says in the error message.