Green bill is an app that aims to reduce the number of physical paper bills that are printed. Green Bill uses the QR code generated uniquely for every transaction which can be directly used for payments so that paper bills need not be printed.
When the green bill user first registers after downloading the app and once registered is able to choose a store and create his own bill. Once he clicks the checkout, the bill is digested into a QR code and presented. This QR code can be scanned for direct payment of the bill.