Tomorrow's commercial world looks set to become increasingly complex and open! Today's retail players must anticipate and rethink the entire retail process to ensure consistency between their online and offline distribution channels. Indeed, the border between physical and e-commerce is disappearing and we are witnessing the advent of a new era: that of "connected" commerce. Physical and virtual shops are increasingly interdependent and connected to the outside world. This thesis focuses on the digitalisation of the point of sale.