It gets a little messy when the customer doesn't enter the amount of available GV funds, on page 2 of checkout, that is supposed to apply to the present order. If your customer didn't do that, then she still has 12 bucks of GV money. One way to handle it is to not charge her $12 of that merchandise, i.e., if she paid w/ PayPal send her $12 back AND then have her send (gift) her $12 of GV funds to your own e-mail address. She would then be square money-wise, and you could just ignore the $12 that she gifts to your e-mail address. There is probably a way of then deleting that $12 gift that you get -- I don't remember. It's been a while since I experimented with it.