This contribution allows you to place a limit on the purchase amount
for the selected payment module if the order is for a new customer.
The limit is removed for returning customers. The idea is that if the
person is going to place an order for fraudulent purposes, he will
probably not do it for low dollar amounts. Once the customer has
placed an order, it is less likely that his next order would be
fraudulent. This, of course, will not always hold true.