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Mobile Payment possibilites

In reference to Dash, the company who took this patent out, is it still possible to build an app that enables patrons to pay their bar tab via mobile device but using different methods?

From what I understand, the patent covers a mobile phone communicating with a POS system for the specific purposes of organizing, viewing, and paying your bill. (phone to POS)

If someone designed a widget installed on the POS system to communicate w/ the phone, would that infringe on this patent? (phone to widget, widget to POS)

Basically, can you tweak a design w/ the end goal of allowing users to pay for tabs mobily, without infringing on this patent?