Techniques associated with a customer-facing device and a merchant-facing device are described herein. In an example, a system can include a customer-facing device configured with a customer application that is executable on an operating system of the customer-facing device to (i) display information to a customer and (ii) receive input from the customer, wherein the customer-facing device includes a payment reader to read payment data from a payment instrument in association with a payment transaction between the customer and a merchant, and a merchant-facing device configured with a merchant application that is executable on an operating system of the merchant-facing device to (i) display information to the merchant and (ii) receive input from the merchant. In at least one example, the customer-facing device and the merchant-facing device can communicate to process, at least in part, the payment transaction associated with the payment instrument via a remote payment service system.