> ## Documentation Index
> Fetch the complete documentation index at: https://docs.y.uno/llms.txt
> Use this file to discover all available pages before exploring further.

# Protect card data and authenticate payments

> Keep PCI scope small, authenticate cardholders with 3D Secure and move card tokens in or out of the Yuno vault.

Guide hub

14 pages

These pages cover what Yuno does with card data and what stays on your side. Read them before you pick an integration, because that choice sets your PCI scope.

> **[Start here: 3D Secure](https://docs.y.uno/docs/security-and-compliance/3d-secure.md)**
>
> Concept 3DS2 authentication flows, the configuration they need and the integration options for card payments.

## 01 Set up

> **[PCI compliance](https://docs.y.uno/docs/security-and-compliance/pci-compliance.md)**
>
> Concept How Yuno tokenization and each SDK option reduce your PCI DSS scope.

> **[Co-badged cards compliance](https://docs.y.uno/docs/security-and-compliance/co-badged-cards-compliance.md)**
>
> Concept The EU network selection rule for co-badged cards and how the SDK meets it.

## 02 Build

> **[Network tokens](https://docs.y.uno/docs/security-and-compliance/network-tokens.md)**
>
> Concept Network token lifecycle statuses and how to use them on card payments.

> **[Card verification](https://docs.y.uno/docs/security-and-compliance/card-verification.md)**
>
> Guide Confirm a card is valid at enrollment or payment without charging it.

> **[Card fingerprint](https://docs.y.uno/docs/security-and-compliance/fingerprint.md)**
>
> Guide Detect repeat enrollments of one card from its fingerprint hash.

## 03 PCI Proxy

> **[PCI Proxy overview](https://docs.y.uno/docs/security-and-compliance/pci-proxy/overview.md)**
>
> Concept Send raw card data to third-party APIs through Yuno's PCI DSS Level 1 environment.

> **[Forward proxy](https://docs.y.uno/docs/security-and-compliance/pci-proxy/forward-proxy.md)**
>
> Guide Call a third-party API with real card data by referencing vaulted tokens.

> **[Destination allowlist](https://docs.y.uno/docs/security-and-compliance/pci-proxy/allowlist.md)**
>
> Guide Register every host the PCI Proxy may send card data to.

> **[Destination authentication](https://docs.y.uno/docs/security-and-compliance/pci-proxy/destination-authentication.md)**
>
> Guide Store HMAC or mTLS credentials once so the proxy authenticates each forward.

## 04 Migrate

> **[Token migration process](https://docs.y.uno/docs/security-and-compliance/data-migration-processes/token-migration-process.md)**
>
> Guide Steps, data format and security rules for importing tokenized cards.

> **[Network token migration process](https://docs.y.uno/docs/security-and-compliance/data-migration-processes/network-token-migration-process.md)**
>
> Guide Move network tokens from a provider into the Yuno vault.

> **[Migrate via API](https://docs.y.uno/docs/security-and-compliance/data-migration-processes/via-api.md)**
>
> Guide Create customers and enroll their payment methods through API calls.

> **[Exporting tokens from Yuno](https://docs.y.uno/docs/security-and-compliance/data-migration-processes/exporting-tokens-from-yuno.md)**
>
> Guide Eligibility, file format and secure delivery for a token export.

## Related API

Reference [Create 3DS setup](https://docs.y.uno/reference/three-d-secure-setups/create-three-d-secure-setup.md) [Generate network token cryptogram](https://docs.y.uno/reference/network-tokens/generate-network-token-cryptogram.md) [Invoke forward proxy](https://docs.y.uno/reference/pci-proxy/invoke-forward-proxy.md) [Register destination](https://docs.y.uno/reference/pci-proxy/register-destination.md)

## Next

<ol>
  <li>[3DS configuration and testing](https://docs.y.uno/docs/direct-integration-use-cases/3ds-configuration-and-testing.md)Guide Route payments through 3D Secure and test challenge flows with sandbox cards.</li>
  <li>[SCA exemptions](https://docs.y.uno/docs/payment-features/sca-exemptions.md)Guide Ask for PSD2 exemptions on eligible low-risk or recurring payments.</li>
  <li>[Network token authentication](https://docs.y.uno/docs/payment-features/network-token-authentication.md)Guide Authenticate card-on-file payments with network passkeys.</li>
  <li>[Card verification results](https://docs.y.uno/docs/payment-features/card-verification-results.md)Reference The AVS and CVV values the issuer returns on each card payment.</li>
</ol>


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