Web API and external implementations (deprecated)
Business Automation Workflow includes
a sample external implementation that illustrates how to use Business Automation Workflow web API
operations when developing a custom application to enable process
participants to complete a particular step within a process instance.
You can use external implementations to create your own implementation of a service that is invoked as part of the process. When you do this, you have access to the process context and this access is provided by the web API.
When a process instance reaches a step handled by an external implementation, the process server does not invoke the custom application. Instead, after passing all necessary process data to the custom application, the process server ceases its work on the process instance. When the custom application completes, the process server resumes its work on the process instance, using any updated process data received from the custom application.