Multi-device point-of-sale system having multiple customer-facing devices

A method comprising:

• presenting, via a merchant application associated with a merchant-facing device, a merchant user interface (UI) on a display of the merchant-facing device, wherein the merchant application is provided by a payment processing service;
• presenting, via a first customer application associated with a first customer-facing device that is coupled to the merchant-facing device, a first customer UI enabling a first customer to provide payment data associated with a first transaction, wherein the first customer application is provided by the payment processing service, and wherein the payment data is associated with a payment instrument of the first customer;
• presenting, via a second customer application associated with a second customer-facing device that is coupled to the merchant-facing device, a second customer UI enabling the first customer to enter a gratuity associated with the first transaction at a later time than providing the payment data, wherein the second customer application is provided by the payment processing service;
• receiving, via the first customer application, the payment data;
• transmitting the payment data from the first customer application to the merchant application;
• and
• transmitting, from the merchant application, the payment data to one or more servers associated with the payment processing service for processing a payment associated with the first transaction.

A system comprising:

• one or more processors;
• one or more computer-readable media comprising one or more instructions, that when executed by the one or more processors, cause the one or more processors to perform operations comprising:
• presenting, via a merchant application associated with a merchant-facing device, a merchant user interface (UI) on a display of the merchant-facing device, wherein the merchant application is provided by a payment processing service;
• presenting, via a first customer application associated with a first customer-facing device that is coupled to the merchant-facing device, a first customer UI enabling a customer to submit payment information associated with a transaction, wherein the first customer application is provided by the payment processing service, and wherein the payment information is associated with a payment instrument of the customer;
• presenting, via a second customer application associated with a second customer-facing device that is coupled to the merchant-facing device, a second customer UI enabling the customer to submit a gratuity associated with the transaction at a later time than submitting the payment information, wherein the second customer application is provided by the payment processing service;
• receiving, via the first customer application, the payment information;
• transmitting the payment information from the first customer application to the merchant application;
• and
• transmitting the payment information from the merchant application to one or more servers associated with the payment processing service for processing a payment associated with the transaction.