> 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/implement-nfc-wallet/tokenize-a-card/digitize-card/handle-red-flow.md).

# Gestionar el flujo rojo

## Descripción general

El flujo rojo ocurre cuando el backend del emisor rechaza **Tokenización**.

El rechazo normalmente está impulsado por reglas de riesgo o por la política del programa.

Cuando esto sucede, la aplicación debe mostrar un mensaje de rechazo al usuario final.

## Diagrama de secuencia

<figure><img src="/files/223a6e193bc31e45ca7aeef10a39a469172600be" alt=""><figcaption><p>Flujo rojo: el backend del emisor rechaza la tokenización y el SDK de Wallet NFC emite <code>digitizationDeclined</code>.</p></figcaption></figure>

## Integrar el SDK

Después de que tú [Verificar la elegibilidad de la tarjeta](/nfc-wallet-sdk-ios/es/implement-nfc-wallet/tokenize-a-card/check-card-eligibility.md):

1. Llama a `CardDigitizationService.digitizeCard()`.
2. Escuchar `CardDigitizationService.eventStream`.
3. Cuando el SDK de Wallet NFC emite `digitizationDeclined`:
   * Detén el flujo de digitalización.
   * Muestra un mensaje de rechazo.
   * Ofrece una opción de reintento (opcional).

```swift
func digitizeCard(_ termsAndConditions: CardDigitizationService.TermsAndConditions) async throws {
    // Paso 1: Inicializar el servicio.
    let cardDigitizationService = CardDigitizationService()
    let fcmToken: String = "FACY6074293608087656831WRF1234" // Solo un ejemplo.

    // Paso 2: Iniciar la digitalización.
    try await cardDigitizationService.digitizeCard(withTNC: termsAndConditions.accept(),
                                                  pushToken: fcmToken,
                                                  language: "en")

    // Paso 3: Escuchar los resultados.
    for await state in await cardDigitizationService.eventStream {
        switch state {
        case .digitizationDeclined:
            // Flujo rojo: tokenización rechazada por el backend del emisor.
            // Muestra un mensaje de rechazo y detén el flujo.
            return
        default:
            break
        }
    }
}
```


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