Google Pay - Make secure payments right through your Android device.
Rainmaker - Rainmaker allows you to make your Google Contacts better.
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
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.
AirPay - Integrate all payment channels via one single API
dip - accountability groups for developers