Abstract: The proposed technique relates to cash register implemented by means of a tablet type digital touchpad device (400). The digital touchpad device (400) is fixed to a main module (100) that comprises: a central unit (102); an interchangeable support (107) adapted to maintaining said digital touchpad device (400); a hinged arm (110), of which one of the extremities, called a first extremity, is linked by a first pivot link (111) to said central unit (102), and of which the other extremity, called a second extremity, is linked by a second pivot link (112) to a receiving plate to which said interchangeable support (107) is fixed. The proposed cash register is modular, and it optionally comprises an optical reader module and/or a payment module on which a payment terminal is positioned.