Test Your Set Up

You can send a test API request to validate that your account, API key, HTTP headers, and HTTP message body are working as intended.
Cybersource
recommends that you test and verify that your payment system can securely send and receive REST API messages before transitioning to a production account.
Postman Testing Method
You can verify your HTTP signature message using Postman. To download a Postman collection of basic payment API requests, see the Cybersource REST API collection on the Postman website.
When testing an API outside of the Developer Center's API Reference sandbox, send your test API requests to the test server:
https://apitest.cybersource.com
For example, to test an authorization request, you can send the request to this endpoint:
https://apitest.cybersource.com
/pts/v2/payments