Braintree - An all-in-one solution to accept, process, and split payments in your mobile app or online - from small business to large enterprise.
Omise - Powerful Payment API as simple as accepting cash.
Razorpay - Payment gateway solution for India with robust, developer friendly API and simple economic pricing.
DusuPay.com - Global Payments with Africa
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
Deal.io - Accept payments with QR codes or unique links