Computer with external USB NFC reader
Basic and the most easiest configuration. You need just PC (notebook) and USB NFC reader. Together with Piggy web application you can create new customer account, credit user account, activate NFC tags (smartcard, badge, sticker) and create reports for invoicing. PC with NFC reader can be used also for payment for goods. There is a section Register with list of predefined goods or products which customer purchase. Payment is done by attaching the tag to NFC reader.