This document provides instructions for processing various payment methods at checkout, including coupons, tax exemptions, Purdue discounts, credit cards, gift cards, dining dollars, boiler express, room charges, and testing bills for authenticity. It describes how to handle coupon discounts, tax exemptions for students, Purdue employee discounts, processing credit card payments including when cards are declined, and how to use gift cards, dining dollars, and boiler express that are linked to Purdue IDs. It also covers processing room charges for hotel guests and temporary credit cards for conferences, as well as checking account balances and giving cash returns.