How to Create Custom GET APIs in Windchill for Retrieving Folder Data

We have noticed that in our Windchill environment, some custom GET APIs have been added to WRS. By custom I mean they have names like test, deneme, etc., and in some cases, they match folder names. When we send a request to these APIs, they return the data contained within the corresponding folder in Windchill.
The issue is, we don’t know who created these APIs — it seems someone did it unintentionally, and we only discovered them later.

Does anyone know how this can be done, or have any documentation or examples explaining the process? This could be very useful in our development workflows.