To access SAM.gov data via an API (application program interface) with a system account, you are required to login with the system account and provide an API key. You can generate and access an API key for the system account within the system account profile page. If you do not have a system account, review these steps to request a system account (KB0017608). You may need to contact your system administrator or system manager for further assistance.
GSA provides technical documentation for APIs. Review the list of available GSA APIs at this link (KB0017810).