Credit, debit, and prepaid cards issued in the United States, general purpose and private label, combined to generate $7.584 trillion in purchase volume in 2019, up 8.2% over 2018. U.S. merchants that accepted those cards as payment for their goods and services paid $116.43 billion in processing fees, up 7.7%. Interchange fees charged in the Visa and Mastercard systems are the largest component of total processing fees merchants pay. Credit cards with Visa, Mastercard, Discover, and American Express brands, combined with private label store, gasoline, medical, etc. credit cards, accounted f...