Hi,
In order to ease the use of the CSP 2100 APIs, I've created a new repo which is containing the Postman collection.
Have a look at it: https://github.com/jgarnier/csp_2100_postman, there is details on importing the collection, creating the environment file which will reflect your CSP env, and then playing with APIs.
There is not yet all the CSP APIs in the collection but contributions are always more than welcome.
Have fun and do not hesitate to clone the repo and raise any issues if any.
Thanks,
Jérémie