I am trying to setup WA for a non-profit organization, but I their payment system is a little different than the regular method in WA.

This organization offers free classes to low-income families, which are held on certain dates/times/locations. I am planning to use the event manager to post those classes and process their registration.

This organization also offers custom classes for professional groups. They get to schedule their own choice of date/time/location and the class comes to their office or group. This service costs money, which is used to help fund the free classes.

I want to these people to be able to register for a custom class through an online form (built in Wufoo) and pay through Paypal. But I can't figure out how to integrate the 'pay now' button to get the user over to the Paypal shopping cart.

I don't think WA's standard Paypal integration will work here because it only seems to be available through the standard event list (which I'm using for free class registrations, plus these paid classes do not yet have a date/time set when the user requests it and pays) or the donate form (which doesn't seem to allow any extra customization).

Can someone point me in the right direction of how I might be able to accomplish getting the paying user to Paypal? I am completely stuck.