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.
Google Payment API - Enable an easy-to-use checkout experience for customers
Razorpay International Payments - Easiest way to accept payments in 100 currencies 🇮🇳
Giftbit Payment API - Stripe for gift cards
MangoPay - End-to-end technology for marketplaces and crowdfunding
ACH payments with Stripe - Accept bank payments with a few lines of code.