i want to be able to add a discount code based on what the admin inputs
12345 = -10%
3456 = -£25.00
then have the user input this code into a form feild on the either checkout page or shopping cart to deduct this off the total of the cart / checkout page<?php echo $XCart_sumTotal; ?> is the total before the shipping and <?php echo $XC_GranTotal; ?> is after
what is the best way to do this?