I think you need to describe things in more detail. Is your "still used ticketing system" a FileMaker database or some other system?
The System we have been using for several years is RT Request Tracker not related to File Maker. RT has a REST interface that allows me to export the data however I need. I know filemaker can import CSV files from excel format. But is it able to do it via a remote string rather than csv file? (Maybe this is more clear)
It helps, and confirms my guess as to why you want to export from this system and import into FileMaker, but what do you mean by a "remote string"?
Well the RT Database is not compatible with File maker. So my plan is to write a web script that gets Ticket information from RT and returns that as a CVS String that IS compatible with file maker. I am unsure as to wether file maker has the capability to read a CVS string from a HTTP Request