A printing device body reads-in at least one of printing-medium-type information relating to a type of a printing medium provided in a printing-medium unit and stored in printing-medium storage unit, and ink-type information relating to a type of ink contained in an ink unit and stored in ink storage unit. A first quantity characterizing the amount of substances supplied to the exhaust gas aftertreatment system, based on first characteristic operating quantities, is determined in a first operating state. The circuit device has a central processing unit, a connection port, a memory, a connection interface, a controller integrated circuit and a data storage device. The resulting mold is especially useful for providing an economical way to improve manufacturing quality of contact lenses. The configured payment data is transmitted to the selected payment network, for use in effecting electronic payment for the transaction.