Braintree - An all-in-one solution to accept, process, and split payments in your mobile app or online - from small business to large enterprise.
Swell.is - Customizable, API-first ecommerce platform for innovative brands, startups, and agencies.
Razorpay - Payment gateway solution for India with robust, developer friendly API and simple economic pricing.
Shopify - Shopify is a powerful ecommerce platform that includes everything you need to create an online store and sell online. Try it free for 14 days.
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
Vendure - Open-source headless e-commerce framework for developers