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Payer Authentication {#payer-authentication}
============================================

26.03.01
--------

New Test Card Numbers
:
![](/content/dam/documentation/cybs/en-us/topics/reference/notes/doc-relnotes/images/new-15x75.svg/jcr:content/renditions/original) Added RuPay card numbers for the 3-D Secure 2.x test cases. See [Test Cases for 3-D Secure 2.x](https://developer.cybersource.com/docs/cybs/en-us/payer-authentication/developer/all/so/payer-auth/pa-testing-intro/pa-testing-3ds-2x-intro.md "").

Updated the Flex Microform Endpoints
:
![](/content/dam/documentation/cybs/en-us/topics/reference/notes/doc-relnotes/images/update-15x75.svg/jcr:content/renditions/original) The REST Test and Production endpoints for checking enrollment and validating 3-D Secure transactions while using Flex Microform tokens were corrected. See [Checking Enrollment When Using a Flex Microform Token](https://developer.cybersource.com/docs/cybs/en-us/payer-authentication/developer/all/so/payer-auth/pa2-use-tokens-flex/pa2-use-token-flex-enroll-intro.md "") and [Validating a Challenge When Using a Flex Microform Token](https://developer.cybersource.com/docs/cybs/en-us/payer-authentication/developer/all/so/payer-auth/pa2-use-tokens-flex/pa2-use-token-flex-validate-intro.md "").

Updated Step-Up Payload Description
:
![](/content/dam/documentation/cybs/en-us/topics/reference/notes/doc-relnotes/images/update-15x75.svg/jcr:content/renditions/original) Clarified that the Step-Up response is not URL-encoded or Base64-encoded by removing the statement. See [Receiving the Step-Up Results](https://developer.cybersource.com/docs/cybs/en-us/payer-authentication/developer/all/so/payer-auth/pa2-ccdc-stepup-frame-intro/pa2-ccdc-stepup-frame-receiving-stepup-results.md "").  
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