Step 2B: Test Your Shared Secret Key Pair {#restgs-shared-secret-test}
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After creating your shared secret key pair, you must verify that your key pair can successfully process API requests. Follow these steps to validate your key pair in the Developer Center and the `Business Center`.

1. Go to the Developer Center's API Reference page:  
   [https://developer.cybersource.com/api-reference-assets/index.html#payments_payments_static-home-section](https://developer.cybersource.com/api-reference-assets/index.md#payments_payments_static-home-section "")
2. On the left navigation panel, click **[API Endpoints \& Authentication](https://developer.cybersource.com/api-reference-assets/index.md#static-api-endpoints-section "")**.
3. Under Authentication and Sandbox Credentials, go to the Authentication Type drop-down menu and choose **HTTP Signature**.
4. Enter your organization ID in the **Organization ID** field.
5. Enter your key ID in the **Key** field.
6. Enter your shared secret key in the **Shared Secret Key** field.
7. Click **Update Credentials**.  
   A confirmation message displays stating that your credentials are successfully updated.  
   ![](/content/dam/documentation/cybs/en-us/topics/platform/rest/getting-started/images/restgs-dev-center-http.png/jcr:content/renditions/original)
8. Go to the Developer Center's API Reference and navigate to **Payments \> `POST` Process a Payment**.
9. Click **Send**.  
   ![](/content/dam/documentation/cybs/en-us/topics/platform/rest/getting-started/images/restgs-dev-center-ex.png/jcr:content/renditions/original)  
   A message confirms that your request was successful with the status code 201.  
   ![](/content/dam/documentation/cybs/en-us/topics/platform/rest/getting-started/images/rstgs-success-201.png/jcr:content/renditions/original)
10. Log in to the `Business Center`:  
    [`https://businesscentertest.cybersource.com`](https://ebc2test.cybersource.com/ebc2/ "")
11. On the left navigation panel, choose ![](/content/dam/documentation/cybs/en-us/common/images/ebc/ebc-icon-trxn-mgmt.svg/jcr:content/renditions/original) **Transaction Management \> Transactions**.
12. Under Search Results, verify that the request ID from the test authorization response is listed in the Request ID column.  
    If the test authorization was successful, a success message is present in the corresponding Applications column.  
    ![](/content/dam/documentation/cybs/en-us/topics/platform/rest/getting-started/images/restgs-verify-key-pair.png/jcr:content/renditions/original)