In our 36-criterion evaluation of merchant payment providers, we identified the 11 most significant ones — ACI Worldwide, Adyen, Checkout.com, Cybersource, Fiserv, Global Payments, J.P. Morgan Payments, PayPal, Stripe, Worldline, and Worldpay from FIS — and researched, analyzed, and scored them. This report shows how each provider measures up and helps digital business professionals select the right one for their needs.