I think so, I do the payment less their fees, check the shipping (whether or not there is a shipping charge). Some of the auctions are w/o shipping charges. I can't think of any other charges their might be excepting those of eBay at the end of the month.

Could it be when doing a refund, I just go into the payment and change the original payment to $0.00 and the fees to $0.00 instead of re-entering them.