> For the complete documentation index, see [llms.txt](https://docs.payments.thalescloud.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.payments.thalescloud.io/nfc-wallet-sdk-ios/es/get-started/configuration/4.-push-notifications/handle-push-tokens.md).

# Gestionar tokens push

## Regístrese para recibir notificaciones push

### Registrar APNs y FCM

El siguiente ejemplo muestra una configuración típica de iOS:

* Configure Firebase.
* Solicite permisos de notificación.
* Regístrese en APNs.
* Proporcione el token de APNs a Firebase Messaging.

{% hint style="info" %}
La configuración de FCM (configuración del proyecto de Firebase, entitlements, clave de APNs, etc.) queda fuera del alcance de esta guía.

Para obtener detalles de la configuración, consulte [Introducción a FCM](https://firebase.google.com/docs/cloud-messaging), [Descripción general de la arquitectura de FCM](https://firebase.google.com/docs/cloud-messaging/fcm-architecture) y [Acerca de los mensajes de FCM](https://firebase.google.com/docs/cloud-messaging/concept-options).
{% endhint %}

{% code title="Registrar APNs y FCM" %}

```swift
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        
        // ...
        
        // Usa la biblioteca de Firebase para configurar las API
        FirebaseApp.configure()

        // Registrar notificación de usuario 
        let settings: UIUserNotificationSettings = UIUserNotificationSettings(types: [.alert, .badge, .sound], categories: nil)
        application.registerUserNotificationSettings(settings)
      
        // Registro de Firebase 
        Messaging.messaging().delegate = self
        // Registrarse para notificaciones remotas 
        application.registerForRemoteNotifications()
        return true
}
```

{% endcode %}

## Actualizar el token push en NFC Wallet

El token push puede cambiar (por ejemplo, después de reinstalar la app o cuando Firebase actualiza el token). Cuando esto ocurre, su aplicación de billetera digital debe notificar al SDK de NFC Wallet llamando a `NotificationService.updatePushToken`.

{% hint style="info" %}
El SDK de NFC Wallet detecta cuando el token no ha cambiado y evita llamadas innecesarias al backend de NFC Wallet.
{% endhint %}

```swift
func messaging(_ messaging: Messaging, didReceiveRegistrationToken fcmToken: String?) {
    guard let fcmToken else { return }
      do {
          // actualizar el token push 
          let notificationService = try NotificationService()
          try await notificationService.updatePushToken(token)
        } catch {
          // gestión de errores
        }
}
```


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