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Create or Submit a REST---API Response MLE Key {#restgs-security-mle-reply}
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Before you can enable your system to support MLE, you must create or upload an *REST---API response MLE* certificate. After creating or uploading the certificate, you can extract the certificate's key to begin enabling MLE.  
Follow these steps to create or submit an API Response MLE certificate using the `Business Center`:

1. Log in to the `Business Center`:

   * **Test:** [`https://businesscentertest.cybersource.com`](https://ebc2test.cybersource.com/ebc2/ "")
   * **Production:** [`https://businesscenter.cybersource.com`](https://ebc2.cybersource.com/ebc2/ "")
   2. On the left navigation panel, choose ![](/content/dam/new-documentation/documentation/en-us/common/images/ebc/ebc-icon-pymt-config.svg/jcr:content/renditions/original) Payment Configuration \> Key Management.  
      ![](/content/dam/new-documentation/documentation/en-us/topics/platform/rest/getting-started/images/left-navigation.png/jcr:content/renditions/original)
   3. Click + Generate key.  
      ![](/content/dam/new-documentation/documentation/en-us/topics/payments-processing/payment-services/sec-keys/images/generate-key.png/jcr:content/renditions/original)
2. Under REST APIs, choose **REST -- API Response MLE** , and then click **Generate key** .  
   ![](/content/dam/new-documentation/documentation/en-us/topics/platform/rest/getting-started/images/restgs-mle-reply.png/jcr:content/renditions/original) {#restgs-security-mle-reply_step-4}
   {#restgs-security-mle-reply_step-4}

3. Choose one of these options to download your key:

   * To create a new API response MLE certificate, click **Download key** ![](/content/dam/new-documentation/documentation/en-us/common/images/ebc/ebc-bttn-download.svg/jcr:content/renditions/original) .
   * To upload your own certificate, enter your public PEM-formatted certificate in the text box, then click **Download key** ![](/content/dam/new-documentation/documentation/en-us/common/images/ebc/ebc-bttn-download.svg/jcr:content/renditions/original) . The *.pem* file downloads to your desktop. If prompted by your system, approve the location for where the file downloads.

   ![](/content/dam/new-documentation/documentation/en-us/topics/platform/rest/getting-started/images/restgs-mle-reply-submit.png/jcr:content/renditions/original) {#restgs-security-mle-reply_step-5}
   {#restgs-security-mle-reply_step-5}
   6. If you are creating a certificate, the Set a Password window appears. Create a password for the certificate by entering the password into the New Password and Confirm Password fields, and then click Generate key.  
   The *.p12* file downloads to your desktop. If prompted by your system, approve the location for where the key downloads.  
   ![](/content/dam/new-documentation/documentation/en-us/topics/platform/rest/getting-started/images/restgs-set-pass.png/jcr:content/renditions/original)  
   You can create or upload another key by clicking **Generate another key**. To view all of your created keys, use the Key Management page.

   > IMPORTANT
   > Securely store the *.p12* file and password in your system. These credentials are required to implement certain products and you must be able to access them.
   > {#restgs-security-mle-reply_step-6}
   > {#restgs-security-mle-reply_step-6}

4. Click **Cancel** .  
   The Key Management page appears. {#restgs-security-mle-reply_step-7}
   {#restgs-security-mle-reply_step-7}

5. Click the Key Type filter and choose **REST-API Response MLE**.{#restgs-security-mle-reply_step-8}
   {#restgs-security-mle-reply_step-8}

6. Click the Expires At filter and choose **All Dates**.{#restgs-security-mle-reply_step-9}
   {#restgs-security-mle-reply_step-9}

7. Click **Search**.{#restgs-security-mle-reply_step-10}
   {#restgs-security-mle-reply_step-10}

8. Find the REST--API Response key that you created in the Search Results table and save its key ID.  
   The key ID is needed to test and configure your system to use MLE.  
   ![](/content/dam/new-documentation/documentation/en-us/topics/platform/rest/getting-started/images/restgs-mle-ebc-key-mgmt.png/jcr:content/renditions/original) {#restgs-security-mle-reply_step-11}
   {#restgs-security-mle-reply_step-11}

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**Test Your REST--API Response MLE Key**
:
To test your REST--API Response key, see [Test Your REST---API Response MLE Key](/docs/cybs/en-us/security-keys/user/all/ada/security-keys/restgs-jwt-message-mle-dev-center.md "").  
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* [Customer Support](https://support.visaacceptance.com/)
* [REST API Field Reference Guide](https://developer.cybersource.com/docs/cybs/en-us/api-fields/reference/all/rest/api-fields/rest-api-fields-intro.md)