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

Swift 4 + Firebase (5.3.0)

func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
    InstanceID.instanceID().instanceID(handler: { (result, error) in
        if let error = error {
            print("Error fetching remote instange ID: \(error)")
        } else if let result = result {
            print("Remote instance ID token: \(result.token)")
        }
    })
}