Reprogrammable point-of-sale transaction flows

A method comprising:

• receiving, at a first application executing on a computing device associated with a merchant, a request associated with at least one of a modification to one or more steps of a default transaction flow, an addition of a step to the default transaction flow, or an omission of a step of the default transaction flow, wherein the first application is developed by a payment service and the request is received (i) from a second application developed on or for the merchant and (ii) via payment service payment functionality provisioned to the second application from the payment service;
• determining, by the first application, that the default transaction flow is to be modified based on the request;
• modifying, by the first application, the default transaction flow to generate a modified transaction flow;
• and
• causing, by the first application, the modified transaction flow to be presented on a display associated with the computing device.

One or more non-transitory computer-readable media storing instructions executable by one or more processors that, when executed by the one or more processors, cause the one or more processors to perform acts comprising:

• receiving, at a first application executing on a computing device associated with a merchant, a request to modify one or more steps of a default transaction flow, wherein the first application is developed by a payment service and the request is received (i) from a second application developed on or for the merchant and (ii) via payment service payment functionality provisioned to the second application from the payment service;
• determining, by the first application, that the one or more steps of the default transaction flow are to be modified based on the request;
• modifying, by the first application, the one or more steps of the default transaction flow to generate a modified transaction flow;
• and
• causing, by the first application, the modified transaction flow to be presented on a display associated with the computing device.