Customers on iOS and Android devices can pay for their purchases from merchants using their Venmo account. The customer can connect their Venmo wallet to your mobile app through a one-time app switch, and then seamlessly pay for all future transactions via Venmo without leaving your app.
The Venmo customer base is highly social and highly mobile. Paying with Venmo gives customers the flexibility to fund transactions using their Venmo balance or any of their saved payment methods, while you enjoy your same low processing rate for all those transactions.
Currently, Venmo payments are only available to certain merchants in the US. See the full eligibility details in the developer docs.