Wanted: Plugin for Members/Customers to Buy Credits

This idea is for yoga/pilates studios, gyms, etc.

I would like to be able to keep a profile of customers, the credits they purchase, the classes they are taking that’s using their credits, and their payment history when they purchased their credits. The idea of credits works best because a customer that wants to purchase one class at a time might get charged a more expensive per class rate than a customer that buys 5 classes up front, and it would be even cheaper for 10 classes and so on. Each time a customer schedules a class, they use one of their credits.

Ideally I would like customers to be able to (1) register for an account, (2) purchase credits, (3) have the ability to schedule a class with their credits so we know how many people to expect, and (4) get an email notification when they are low on credits.

Most of the plugins I have looked at handles classes on a monetary system, but not a credit system. There are also membership plugins that work on credits, but they mainly handle paying to see content on your site. Does anyone know of any plugins that can handle what I am looking for?