It depends on how you run the fundraiser...is the checks/cash going to you and then you send money to the organization? Or do they pay the group who in turn pays you? If they are paying you directly, which is sounds like they are, have them fill out a separate sales slip with the name, address, phone number, card number, exp date, name on card, signature, and run it when they are turned in. It's such a pain...would you lose business if you didn't accept credit cards for a fundraiser?