You can update execution plan runs that are executed from an external execution environment through the REST API, accessible from host:port[/inst]/Services1.0/swagger-ui.html, where host is your Silk Central host. For example http://localhost:19120/Services1.0/swagger-ui.html.
For authentication within the REST API calls, generate a web-service token in the User Settings page of the Silk Central UI. To access this page, hover the mouse cursor over the user name in the Silk Central menu and select User Settings.
You can also create a session ID for authentication within the API calls.
For information on how you can limit the usage of the REST API services for a web-service token or for a session ID, see JMX Measures for Limiting Usage of REST Services.