Push Notifications

    
    func registerForPushNotifications(application: UIApplication) { // just call this on idFinishLaunchingWith options
        let notificationSettings = UIUserNotificationSettings(
            types: [.badge, .sound, .alert], categories: nil)
        application.registerUserNotificationSettings(notificationSettings)
    }
    
    func application(_ application: UIApplication, didRegister notificationSettings: UIUserNotificationSettings) {
        
        if notificationSettings.types != .none {
            application.registerForRemoteNotifications()
        }
        
    }
    
    func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
        let token = deviceToken.hexString()
        print(token)
    }
    
    func application(_ application: UIApplication, didFailToRegisterForRemoteNotificationsWithError error: Error) {
        print("Failed to Register for remote notifications")
    }

extension Data {
    func hexString() -> String {
        return self.reduce("") { string, byte in
            string + String(format: "%02X", byte)
        }
    }
}