Starting with version 1.0.5 of Cygnus, a Swagger with open API methods is available in Test IT. Swagger can be opened by following the direct link /swagger/index.html, or by pressing the "API documentation" button in the Autotests section.
There are two ways to authorize in Swagger:
Use a Bearer token copied from a Network section of dev tools in a web browser by an authorized user.
Use a Private token that any authorized user can get from their profile.
There are documented methods for managing projects, sections, work items, autotests, and setting results via API available in Swagger.