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Credentialed Transactions Developer Guide {#credentials-about-guide}
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This section describes how to use this developer guide and where to find further information.

Audience and Purpose
:
This guide is written for application developers who want to use the `REST API` to integrate payment card processing using credentials into an order management system.

    Implementing the `Cybersource` payment services requires software development skills. You must write code that uses the API request and response fields to integrate the credit card services into your existing order management system.

    Visit the [`Cybersource` documentation hub](https://developer.cybersource.com/docs.md "") to find additional processor-specific versions of this guide and additional technical documentation.

Convention
:
This statement appears in this document:

    > IMPORTANT
    > An *Important* statement contains information essential to successfully completing a task or learning a concept.

Customer Support
:
For support information about any service, visit the Support Center:

<http://support.visaacceptance.com>  
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