Hi Aditya,
Please try the Model API - https://app.swaggerhub.com/apis/Trimble-Connect/model/v1#/Property%20Set%20Definitions/ListPSetDefs
The documentaiton for PropertySet APIs exist here - https://pset-api.connect.trimble.com/v1
In case you are facing further challenges , could you please send queries to connect-support@trimble.com
Regards
Darshan Kamat