> 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/nfc-wallet-backend/overview.md).

# Overview

The NFC Wallet SDK is the main integration point for NFC Wallet.

This section covers the additional NFC Wallet backend capabilities required to complete the integration.

To support card enrollment, you need to:

* Implement card encryption - see [Encrypt card information](/nfc-wallet/nfc-wallet-backend/card-enrollment/encrypt-card-information.md).
* Build the authentication token for green flow enrollment - see [Build authentication token](/nfc-wallet/nfc-wallet-backend/card-enrollment/build-authentication-token-old.md).


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