Use case of QR & UPI in Restaurant/Hotel business. After having my meal can I get a DYNAMIC QR on my hard copy Bill, which I can Scan with my Bank App/BHIM and Pay ? Alternatively, I write my VPA on my bill and the cashier initiates a PULL transaction from his counter which I just authenticate it from my mobile. Payment done. Why do I need a card and POS and Debit card pin ??