You should ask the devs if they have a demo acct or demo feed that you can test your scripts with before paying the $50.00
This was the response:
Rapattoni RETS information can be found at this website. Please let us know if you need anything further.

http://www.rapattoni.com/supp/mls/rets/default.asp


I'm obtaining a quote from someone who may be able to do this as it seems I have to rely on doing all the research instead of getting any specific information from them.