What are the steps classmates need to do in order to pay for reunion tickets by credit card?

In order for classmates to purchase anything in the Reunion Planner, you have to first add a product for them to purchase, such as a ticket, and set a price for it. Then, when the register, they can click through to pay for it. You can also select to require purchase of at least one ticket in order to submit a registration form, which is the recommended option if you are actually selling tickets.