We are a shoe store that uses the old-fashioned paper gift certificates. When a customer uses a $100 certificate to purchase a $97 pair of shoes, we would like to cash out the $3.00 balance. I tried "Cash Back" but the software pops up a window saying that I can't use Cash Back on Gift Cards. Is there something in Setup that I need to correct? How can I pay out the small balance and still have my end-of-day totals balance properly?