InterPayments, which sells software that sellers use to recoup interchange, network and acquirer fees associated with accepting credit cards, calls itself a managed surcharge provider. The description applies because surcharging credit card transactions involves more than adding a fee to what buyers pay. Sellers must comply with state, provincial and federal rules pertaining to surcharging as well as to card network rules. Those rules can include caps on surcharges, disclosure rules and proper accounting. This makes surcharging like collecting sales taxes, which differs by jurisdiction. ...