Problem using ionic push

Hi every one
I want to send message from server to client. i know the solution is ionic native push.
but the problem is i don’t know where comes SENDER_ID in command
$ ionic cordova plugin add phonegap-plugin-push --variable SENDER_ID=XXXXXXXXX
and how to send message from server.
can u please help me?
i use
– ionic 3 (app)
– web api 2 (server)

thanks

Hi, @tohellhi
If you want try for push notification, you need configure FCM (Firebase Cloud Messaging).
You Create app in FCM It will give Sender_ID.

Thanks