As an incentive for customers we provide a discount to pay with cash by giving a 3.99% discount on the service fee for this transaction. Pay by cash, check, money order or bank draft and save! U.S. Patented -US 8131619 B1, US 8478689 B1, US 8423439 B1. In the event the subscriber miscalculates service fees or other items, subscriber authorizes merchant to modify amount(s) and apply any adjustment.