OK, we can't comment much further via the Community as it counts as "public" from an Export Law point of view: I can give pointers but with UDFs that may not be enough. This platform was initially intended for Academic usage and is currently evolving to include anyone who wants a "simple but quick" answer.
However, with paid software you should have some level of support (my main task within Ansys is commercial customer support), and given you're a CADFEM customer I'd contact them. There should have been some information given at the time of purchase but from experience I know that can finish up with your company accounts group! Note, UDFs tend to fall slightly outside of the general support so their input may be limited.