Cash App - The easy way to send, spend, bank, and invest.
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.
Facebook Pay - Send money to your friends via Messenger
Shopify Pay - Give shoppers a fast, secure way to pay
PayPal.Me - Request money using your own personalized URL.
Stripe iOS SDK - Accept both Apple Pay and credit card payments easily on iOS