Membership setup questions


I am new to WPMU membership plugin and I can’t figure out how to setup it for my needs (yes, I’ve read the manual).

My plan was this: I am using buddypress + multisite for an educational business site, where each “course” is actually a BuddyPress group with a groupblog. I need a way for customers to pay for each of these courses and get a membership for each group separately. There will be around 400 groups/courses.

So no general “premium membership to access all premium content” approach works here, the membership has to be spesific to each course/group. Another option is that customers could get credits that they could use for any group they wish to join.

What would be the simplest way to do something like this?