The 63 largest portfolios of merchant card acceptance contracts in the U.S. for acquiring payments from global brands—American Express, Discover, Diners Club, JCB, Mastercard, Visa and UnionPay credit, debit, and prepaid cards—in addition to domestic-only debit brands including Interlink, Star, Nyce, Pulse, Accel and others, are ranked here. Listed are acquirers with direct connections into Mastercard, Visa and other settlement systems. Those acquirers settle transactions on behalf of payment facilitators and aggregators including Stripe, Square, Adyen and PayPal as well as independent ...