Prerequisites {#adobe-commerce-r-prerequisites}
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Required Prerequisites
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`Unified Checkout` must be configured for your Merchant ID. See *[Configure the `Unified Checkout` Merchant Experience](https://developer.visaacceptance.com/docs/vas/en-us/unified-checkout/developer/all/rest/unified-checkout/uc-intro-setup/uc-intro-setup-ebc.md "")* guide for details.  
You also must have a REST Shared Secret Key and an API Response MLE Key.  
See the [*Creating a Shared Secret Key Pair*](https://developer.visaacceptance.com/docs/vas/en-us/platform/developer/all/rest/rest-getting-started/restgs-http-message-intro/restgs-security-key-pair-intro/restgs-security-key-pair-task.md "") for information on how to get a REST Shared Secret Key and [*Create a REST - API Response MLE Key*](https://developer.visaacceptance.com/docs/vas/en-us/security-keys/user/all/ada/security-keys/restgs-security-mle-reply.md "") for information on how to get a REST Response MLE Key.