An mPOS (mobile point-of-sale) is a smartphone, tablet or dedicated wireless device that performs the functions of a cash register or electronic point-of-sale terminal (POS terminal) wirelessly. | Design a user flow and UX for point of systems (pos) for Behpardakht with NFC payment, in different types and models of pos. ( more than 10 models). Some of the devices were touchable and some of them were old-fashioned and it was a big challenge in design.