Ios swift – Swift webview device token

I am testing in Swift to send notifications with Firebase and in general it’s working. When i will send a notification to one user, i need the device token of this user. I guess this is not the same as the UUID?
By the creation of the account i like to store this id in the db by adding the id in the url (GET) in the webview page. How can i do that? Is there a solution?

Here’s the ViewController.swift code

import UIKit
import WebKit

class ViewController: UIViewController {
    let webView=WKWebView()
    

    override func viewDidLoad() {
        super.viewDidLoad()
        view.addSubview(webView)

        guard let url = URL(string: "**https://myurl.be/app.php?device=CODE**")else {
            return
        }

        webView.load(URLRequest(url:url))
        // Do any additional setup after loading the view.
    }
    override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()
        webView.frame = view.bounds
        
    }


}

AppDelegate.swift

import UIKit
import FirebaseCore
import FirebaseMessaging
import UserNotifications

@main
class AppDelegate: UIResponder, UIApplicationDelegate {
    let gcmMessageIDKey = "gcm.Message_ID"
    var deviceTokenString: String?
    var testString = "test"
      
       func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
           deviceTokenString = deviceToken.reduce("", {$0 + String(format: "%02X", $1)})
           print("===== deviceTokenString =====")
           print(deviceTokenString ?? "nok")
       }
       
  func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions:
    [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    FirebaseApp.configure()
    // Push Notifications
    if #available(iOS 10.0, *) {
      UNUserNotificationCenter.current().delegate = self
      let authOptions: UNAuthorizationOptions = [.alert, .badge, .sound]
        
  
      UNUserNotificationCenter.current().requestAuthorization(
        options: authOptions,
        completionHandler: { _, _ in }
      )
    } else {
      let settings: UIUserNotificationSettings =
      UIUserNotificationSettings(types: [.alert, .badge, .sound], categories: nil)
      application.registerUserNotificationSettings(settings)     
    }
      
    application.registerForRemoteNotifications()
    Messaging.messaging().delegate = self
    return true
  }

  func application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration {

    return UISceneConfiguration(name: "Default Configuration", sessionRole: connectingSceneSession.role)
  }
    
  func application(_ application: UIApplication, didDiscardSceneSessions sceneSessions: Set<UISceneSession>) 
  }  
}

extension AppDelegate: UNUserNotificationCenterDelegate {
  func userNotificationCenter(_ center: UNUserNotificationCenter,
                              willPresent notification: UNNotification,
                              withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions)
                              -> Void) {
    let userInfo = notification.request.content.userInfo
    print(userInfo)
    completionHandler([[.alert, .sound]])
  }
  
  func userNotificationCenter(_ center: UNUserNotificationCenter,
                              didReceive response: UNNotificationResponse,
                              withCompletionHandler completionHandler: @escaping () -> Void) {
    let userInfo = response.notification.request.content.userInfo
    print(userInfo)
    completionHandler()
  }
  
  func application(_ application: UIApplication,
                   didReceiveRemoteNotification userInfo: [AnyHashable: Any],
                   fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult)
                     -> Void) {
    if let messageID = userInfo[gcmMessageIDKey] {
      print("Message ID: (messageID)")
    }

    print(userInfo)

    completionHandler(UIBackgroundFetchResult.newData)
  }
    
}





extension AppDelegate: MessagingDelegate {
  
  func messaging(_ messaging: Messaging, didReceiveRegistrationToken fcmToken: String?) {
    print("Firebase registration token: (String(describing: fcmToken))")
    
    let dataDict: [String: String] = ["token": fcmToken ?? ""]
    NotificationCenter.default.post(
      name: Notification.Name("FCMToken"),
      object: nil,
      userInfo: dataDict
    )
  }
  
    
    
    
func application(_application:UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data){

        print (deviceToken.map({String(format: "%02x", $0 )}).joined()) //optie1
        print (deviceToken.reduce(""){ $0 + String  (format: "%02.2hhx", $1)}) //optie2
        print (deviceToken.reduce(""){ $0 + String  (format: "%.2x", $1)}) //optie3
        
        
    }
}

I hope to find a solution.