A mobile device presents representations of payment accepting unit events on a display, by identifying a payment accepting unit that is available to accept payment, displaying a visual indication of the payment accepting unit, and accepting user input to receive selection of the payment accepting unit and trigger payment, establishing a wireless communication path including the mobile device and the payment accepting unit, enabling user interaction with the user interface to complete the transaction, exchanging information with the available payment accepting unit via the one or more radio transceivers in conjunction with the transaction, and displaying an updated user interface of the mobile payment application.