PayPal - PayPal is the faster, safer way to pay online without sharing financial details, send and receive money or accept credit and debit cards as a seller
TrueLayer - Simple Bank APIs to access real-time financial data
Stripe - Online payment processing for internet businesses. Stripe is a suite of payment APIs that powers commerce for online businesses of all sizes. Use Stripe’s payment platform to accept and process payments online for easy-to-use commerce solutions.
Plaid - Infrastructure that powers financial technology by enabling applications to connect with users' bank accounts.
Braintree - An all-in-one solution to accept, process, and split payments in your mobile app or online - from small business to large enterprise.
Skrill - Skrill (formerly known as Moneybookers) is the cheaper way to send and receive money worldwide.