Abstract: Embodiments of the present disclosure describe systems, methods, and devices for a common application architecture on multiple point-of-sale hardware platforms to support multiple applications. Such embodiments include monitoring, by for an event. Further, embodiments include selecting an application based on the event. In addition, the embodiments include monitoring a transaction implemented by the application based on the event. The monitoring for the event is performed when common application modules are in an idle state. Further, the selecting of the application based on the event is performed when the common application modules are in an application selection state. In addition, the monitoring transaction is performed when the common application modules are in a transaction state. Such embodiments include determining that the transaction is complete then transitioning from a transaction state to an idle state when the transaction is complete.