Regarding card payments, the rules are changing soon because of Dodd-Frank: http://blog.vantagecard.com/post/Merchant-Card-Acceptance-changes-under-the-Dodd-Fra

Regarding card payments, the rules are changing soon because of Dodd-Frank: http://blog.vantagecard.com/post/Merchant-Card-Acceptance-changes-under-the-Dodd-Frank-Act.aspx http://blog.vantagecard.com/post/Merchant-Card-Acceptance-ch... It's also important to differentiate PIN based transactions from signature based. The "accept all cards" rules are the creation of Visa and Mastercard, they aren't inherent in law, and don't apply to (most? any?) PIN-based debit networks. It's generally not against the rules to charge a surcharge on debit transactions.