I am doing an online course with 13 classes, each costing $10. I need to be able to go from a class selection page, which allows customers to select one or more classes, to the payment page, and then generate a one or two time password so that only they can access the class and only for a limited time, and then return to a page where they enter the password, which will then take them to the class. Can your shopping cart situation handle this? thank you.