Scripted REST APIs

Docs

Scripted rests API is otherwise known as SCRAPIs, Are very versatile and can do almost anything you need to within ServiceNow from an API perspectivethe only thing is that I found that I can't do with scripted REST APIs are generating files to be downloadedand sometimes handling headers in a very specific way.

In those situations you'll have to look at the predecessors descriptive REST APIs which I would say are processors. Processors have sent have been sent deprecated but you can still create them and use them they're just not nearly as common.