Credit card transaction fees are fees paid between banks for the acceptance and processing of a card transaction. Businesses usually pay two fees for each card transaction: one to the bank issuing the card and the other to the bank accepting the payment.
Transaction fees for businesses are usually calculated as a percentage of the total amount spent during a sale. However, some banks set flat fees that are deducted from every payment regardless of how large or small the transaction is. As of 2013, businesses are allowed to pass fees on to customers in the form of a surcharge for using credit cards.