Launch, by Adobe is an entirely API-first application. All system functionality is accessible through the API. The UI at launch.adobe.com is simply a friendly way to interact with them.
This API - known as the Reactor API - uses the JSON API specification. We expect inputs to be compliant with this specification and all outputs are also compliant. You can read more at jsonapi.org.
The full API specification is available under Reference > 1.0 in the navigation.