Unified Click to Pay {#unified-click-to-pay}
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26.04.01
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![](/content/dam/documentation/cybs/en-us/topics/reference/notes/doc-relnotes/images/new-15x75.svg/jcr:content/renditions/original) Added information about client and server keys. See these topics:

* [API Authentication Keys](https://developer.visaacceptance.com/docs/vas/en-us/unified-click-to-pay/developer/all/rest/unified-click-to-pay/uctp-appendix-intro/uctp-keys/uctp-keys-api-keys.md "")
* [JWT Validation Keys](https://developer.visaacceptance.com/docs/vas/en-us/unified-click-to-pay/developer/all/rest/unified-click-to-pay/uctp-appendix-intro/uctp-keys/uctp-keys-jwt-keys.md "")
* [Client-Side PAN Encryption Keys](https://developer.visaacceptance.com/docs/vas/en-us/unified-click-to-pay/developer/all/rest/unified-click-to-pay/uctp-appendix-intro/uctp-keys/uctp-keys-pan-enc-keys.md "")
* [Token Management MLE Keys](https://developer.visaacceptance.com/docs/vas/en-us/unified-click-to-pay/developer/all/rest/unified-click-to-pay/uctp-appendix-intro/uctp-keys/uctp-keys-tms-mle-keys.md "")  
  ![](/content/dam/documentation/cybs/en-us/topics/reference/notes/doc-relnotes/images/new-15x75.svg/jcr:content/renditions/original) Added information about the required keys for checkout() . See [checkout()](https://developer.visaacceptance.com/docs/vas/en-us/unified-click-to-pay/developer/all/rest/unified-click-to-pay/uctp-getting-started/uctp-get-started-checkout.md "") and [checkout() API Specifications](https://developer.visaacceptance.com/docs/vas/en-us/unified-click-to-pay/developer/all/rest/unified-click-to-pay/uctp-api-specifications/uctp-api-specs-checkout.md "").