---
title: Additional resources
description: 'Supporting resources for Card Not Present Verification authentication: a JavaScript implementation example, authentication error codes, and the Postman collection.'
canonical: https://developer.unico.io/dual-api/developers/regional-solutions/card-not-present-verification/integration/authentication/additional-resources
locale: en
generated_by: markdown-export
---

- [Example in JavaScript](/developers/regional-solutions/card-not-present-verification/integration/authentication/additional-resources/example-in-javascript): an implementation example of the authentication for the Card Not Present Verification product.
- [Authentication Errors](/developers/regional-solutions/card-not-present-verification/integration/authentication/additional-resources/authentication-errors): the possible errors that may occur when trying to authenticate with the Card Not Present Verification product.
- [Postman Collection](/developers/regional-solutions/card-not-present-verification/integration/authentication/additional-resources/postman-collection): the Postman collection for the REST API to authenticate with the Card Not Present Verification product.