Instant Payment

Hello, does anybody know a plugin that cand redirect payments to my MU users.
Heres my model:
Lets say that in my WPMU I've got few teachers with their courses different users register to different teachers and pay for their course. Is there a plugin that automaticly splits profits between all of us? I've seen some wp instant pay plugin but don't know how it works and they don't have a demo to try out.