Notifications Firebase

AppDelegate.swift

   //In your app delegate, add the following 
   
       static var  deviceID = String()

   func messaging(_ messaging: Messaging, didRefreshRegistrationToken fcmToken: String) {
        guard  let newToken = InstanceID.instanceID().token() else {return}
        AppDelegate.deviceID = newToken
        connectToFCM()
    }
    
        func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {
    
        let notification = response.notification.request.content.body
     //   print(notification)
        completionHandler()
        
    }
    
        func application(_ application: UIApplication,
                     didReceiveRemoteNotification notification: [AnyHashable : Any],
                     fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {
        
        if Auth.auth().canHandleNotification(notification) {
            completionHandler(.noData)
            return
        }
        // This notification is not auth related, developer should handle it.
    //    handleNotification(notification)
    }
    
        func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
        
        InstanceID.instanceID().instanceID { (result, error) in
            guard let token =  result?.token else {return}
                AppDelegate.deviceID = token
                UserManager.shared.fcmToken = token //ADDED THIS FROM YOUR CODE 
            print("DeviceID")
            self.connectToFCM()
        }
        
    }
    
        func connectToFCM(){
        
        Messaging.messaging().shouldEstablishDirectChannel = true
        
        
    }