Online class registration: prerequisites, class placements and payment plans

Hello,

Are there any institutions out there who currently offer online registration for classes where there are pre-defined:

• Class pre-requisites and/or placement levels?
• Payment plans set up during an online registration?

We are looking to move into a fully capable online version of our current registration protocol, but are unsure of how to navigate these two very important aspects of our current procedures.  

We need to ensure that students are not permitted into the wrong level or into classes for which they do not have the required pre-requisite when they register. We also currently offer several payment plan options which we will also need to set up  with an online selling feature.

Thanks,

Karin