All WSO2 products are built on top of the WSO2 Carbon kernel. WSO2 Carbon is managed internally using SOAP Web services known as admin services. All WSO2 products come with a management console UI, which communicates with these admin services underneath to facilitate administration capabilities through the UI.
However, there can be instances where you want to call these backend Web services directly. For information on how to discover the admin services of WSO2 API Manager and invoke them, see Calling Admin Services from Apps section in WSO2 Carbon documentation.