> 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/implement-nfc-wallet/tokenize-a-card/digitize-card/green-flow-digitization.md).

# Green flow digitization

## Overview

Green flow is a Tokenization flow where the issuer backend approves Tokenization without step-up authentication.

This flow is common when the NFC Wallet SDK is integrated in the issuer application and the end user is already authenticated in-app.

## User experience

See [Green flow user experience](/nfc-wallet-sdk-ios/implement-nfc-wallet/tokenize-a-card.md#green-flow).

## Sequence diagram

<figure><img src="/files/rPardsCUXRy2vR6JnIho" alt=""><figcaption><p>Green flow digitization sequence</p></figcaption></figure>

## Integrate SDK

After you [Check card eligibility](/nfc-wallet-sdk-ios/implement-nfc-wallet/tokenize-a-card/check-card-eligibility.md):

1. Call `CardDigitizationService.digitizeCard()`.

   Include an `authenticationToken` generated by your digital wallet backend.
2. If Tokenization is approved with no conditions (green flow):
   * The NFC Wallet SDK provisions the digital card and payment keys on the device.
   * When provisioning succeeds, the SDK emits the `digitizationApproved` event.

The example below shows how to start digitization and handle the green flow outcome.

```swift
func digitizeCard(
    _ termsAndConditions: CardDigitizationService.TermsAndConditions
) async throws {
    // Step 1: Initialize the service.
    let cardDigitizationService = CardDigitizationService()

    // Step 2: Collect inputs.
    let authenticationToken = Data() // Issuer backend token for green flow enrollment.
    let fcmToken = "FACY6074293608087656831WRF1234" // Example only.

    // Step 3: Start digitization.
    try await cardDigitizationService.digitizeCard(
        withTNC: termsAndConditions.accept(),
        pushToken: fcmToken, // Firebase Cloud Messaging (FCM) token
        language: "en",
        authenticationToken: authenticationToken
    )

    // Step 4: Listen for outcomes.
    for await state in await cardDigitizationService.eventStream {
        switch state {
        case let .digitizationApproved(digitalCardID):
            // Green flow: provisioning succeeded.
            _ = digitalCardID
            return
        default:
            break
        }
    }
}
```


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