> 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-android/es/implement-nfc-wallet/manage-digital-cards/get-an-access-token.md).

# Obtener un token de acceso

## Resumen

Durante **Tokenización**, el SDK de Billetera NFC establece un canal seguro con el **backend de NFC Wallet** cuando usted [Desencadenar aprovisionamiento](/nfc-wallet-sdk-android/es/implement-nfc-wallet/tokenize-a-card/trigger-provisioning.md).

El SDK utiliza este canal seguro para emitir un **token de acceso** para:

* tarjeta digital **LCM**
* notificaciones de transacciones

Los tokens de acceso expiran. Actualícelos cuando sea necesario.

## Integración del SDK

Use `ProvisioningBusinessService` y el **ID de tarjeta digital** para recuperar un token de acceso.

Implemente `AccessTokenListener` para recibir el token en `onSuccess(...)`.

{% hint style="warning" %}
Trate los tokens de acceso como datos sensibles.

No los registre ni los almacene en disco.
{% endhint %}

{% code title="GetAccessToken.java" %}

```java
public void getAccessToken(final String digitalCardId) {
    final ProvisioningBusinessService provisioningService =
            ProvisioningServiceManager.getProvisioningBusinessService();

    provisioningService.getAccessToken(
            digitalCardId,
            GetAccessTokenMode.REFRESH,
            new AccessTokenListener() {
                @Override
                public void onSuccess(final String digitalCardId, final String accessToken) {
                    // Token recuperado con éxito.
                    // Úselo para llamar a los servicios LCM y recuperar notificaciones de transacciones.
                }

                @Override
                public void onError(final String digitalCardId, final ProvisioningServiceError error) {
                    // Manejar errores (por ejemplo, sin conexión de datos).
                }
            }
    );
}
```

{% endcode %}


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