Vue Storefront - Open Source PWA for any eCommerce
Cash App - The easy way to send, spend, bank, and invest.
Square Online Checkout - Create easy pay links for whatever you're selling and start accepting payments everywhere online.
Facebook Pay - Send money to your friends via Messenger
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.Me - Request money using your own personalized URL.