Google Pay - Make secure payments right through your Android device.

Rainmaker - Rainmaker allows you to make your Google Contacts better.

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.

Google Wallet - The Google Wallet mobile app makes your phone your wallet.

dip - accountability groups for developers