Visa Acceptance Solutions Prerequisites {#adobe-commerce-25-2-0-prerequisites}
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Mandatory Prerequisites
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This Visa Acceptance Solutions product must be configured for your Merchant ID:

* `Unified Checkout`

You also must have a REST Shared Secret Key. See the [Getting Started with REST Developer guide](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.

Optional Prerequisites
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These Visa Acceptance Solutions products are optional. If you want these products you must enable and configure your Merchant ID with them.

* `Payer Authentication` for `3-D Secure`
* Tokenization
* Apple Pay
* Google Pay
* Click to Pay

You can also enable Message-Level Encryption (MLE) for additional security. A [REST Certificate](https://developer.visaacceptance.com/docs/vas/en-us/platform/developer/all/rest/rest-getting-started/restgs-jwt-message-intro/restgs-security-p12-intro.md "") is required for MLE.