up_subtotal provides the following buttons/commands: STCA - Set the order's payment method to 'POS Cash' STCC - Set the order's payment method to 'POS Credit' STCK - Set the order's payment method to 'POS Check' The store administrator can set up conditional actions to alter the order based on the payment method. For example, the uc_fee module can be used to charge a fee depending on if the customer is payment with cash or with a credit card.