A method for performing a digital transaction via a mobile device using a POS system that is connected to a wireless local area network comprising the steps: generation of a unique one-time digital code by the POS system (or by the mobile device of the customer) that is used for initiating the transaction; automatic enabling of network access to the wireless local area network after production of the unique one-time digital code, wherein access to the wireless network is permitted by the digital code; connection of the mobile device to the local area network using the digital code and provision of information from the device to the POS system, after the information has been obtained by the POS system from the mobile device, the POS system provides clearance for the transaction.