Rainmaker - Rainmaker allows you to make your Google Contacts better.
Google Pay - Make secure payments right through your Android device.
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.
Cash App - The easy way to send, spend, bank, and invest.
dip - accountability groups for developers
Venmo - Venmo is the best way to pay your friends. It's simple, fun and free to use.