The document proposes a unified payment system that allows merchants to accept various payment options through a single app or device. It would provide simple and secure card and contactless payments via NFC, with instant electronic billing and reporting. The process involves launching the app, swiping a card or tapping an NFC device, entering an OTP or PIN, and confirming the transaction. The system aims to address limitations with existing POS systems like high costs, lack of settlement speed and wallet support.