Notifications6.swift

func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data)
{
    let tokenParts = deviceToken.map { data -> String in
        return String(format: "%02.2hhx", data)
    }
    let token = tokenParts.joined()
    print("Device Token: \(token)")
}

func application(_ application: UIApplication, didFailToRegisterForRemoteNotificationsWithError error: Error)
{
    print(error.localizedDescription)
}