This module integrates two of CyberSource's payment APIs, Secure Acceptance Hosted Checkout (an off-site redirect based solution) and Flex Microform v2 (an on-site iframe based solution). Using either API requires specific account configuration options in your CyberSource account (live or sandbox) and may require manual configuration changes to your Drupal codebase as documented in README.md. Please review this carefully, especially as it pertains to altering Drupal's default SameSite cookie attribute for SAHC usage.
Furthermore, CyberSource's own PHP REST API client library has outdated dependencies that conflict with Drupal's own dependencies. Until those are updated upstream, this module makes use of a fork of the client library maintained by Centarro. If / when it is possible to switch back to the official client library, we will be sure to highlight it in the relevant release notes.