Correct way to retrieve token for FCM - iOS 10 Swift 3

Question

i had implement Firebase with FirebaseAuth/FCM etc and did sent notification successfully through Firebase Console.

However i would need to push the notification from m

Answer 1

Go with the second option, and this is going to seem really stupid/simple, but to fix that nil optional fatal error, just remove the force-unwrap at the end

Your code:
var token = FIRInstanceID.instanceID().token()!
Make it:
var token = FIRInstanceID.instanceID().token()

That will at least fix that nasty crash