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

func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {        
    Messaging.messaging().apnsToken = deviceToken

    let deviceTokenString = deviceToken.reduce("") { $0 + String(format: "%02X", $1) }

    print("APNs device token: \(deviceTokenString)"
}