I have been working with several web APIs lately, and they usually have a call to retrieve the available categories items are stored in, so you can display them and use them in subsequent calls. I do not see anything like this in the documentation? Is there a way to do this, or maybe it can be added in the future? It would be very useful because it would allow categories to be added or changed without having to update the external application each time.

You mean this?

https://invisioncommunity.com/developers/rest-api?endpoint=downloads/categories/GETindex

 

Yes, I guess I am blind.