Capabilities inside SQL Data Catalog expose their aspects through a set of REST APIs. These APIs can be used to automate tasks or create different workflows.  Anything you can do through the web interface, can also be achieved through these HTTP endpoints.

Classification REST API Documentation

Classification REST API documentation is released alongside SQL Data Catalog. You can access it by clicking API in the application header.

Authentication with Classification REST API

In order to use the REST API from external systems, you need to generate an auth token. See Generating an authorization token and Automation with PowerShell.