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you need to get Firebase Server Key and Firebase Sender ID. You will get it with Following steps

In another browser tab Open Firebase Console https://console.firebase.google.com and sign in with your Google account.

Press "CREATE NEW PROJECT" or select an existing one below.

Enter a project name and press "CREATE PROJECT".

Go to project OverView

Click Settings -> Project Settings -> Cloud Messaging

Copy server key And sender Id

And Add it in app and click SAVE

See the link below to view the Firebase video on YouTube

and firebase for ios