VMware vRealize Orchestrator provides Web services APIs so that you can develop applications to access workflows through the Web. The main purpose of the Orchestrator Web services APIs is to allow you to integrate Orchestrator workflows in custom Web-based applications.
Orchestrator provides a Web services API that is based on a representational state transfer (REST) API. The Orchestrator REST API exposes the objects in the Orchestrator inventory and the inventories of the installed plug-ins as resources that you can access at predefined URLs. HTTP requests at these URLs result in triggering operations over workflows. The Orchestrator REST API exposes inventory objects as resources through a set of RESTful Web services that you can use to retrieve the definitions of workflows, run workflows, check the status of the running workflows, cancel workflow runs, process waiting user interactions, retrieve the presentation of workflows, and so on.