Do we need to just scan the HP Pay QR (non-paytm ) and approve via hppay app? Or does it involve additional steps like sharing mobile no and OTP for the attendant to enter in his POS , Like Indian oil voucher ( which mostly deny citing false reasons due to their inconvenience). And i guess there was another similar way of refueling on IOCL and HP bunks where they could refill using your fastag balance after asking mobile no and OTP. Never used any of these 2. If anyone can share the experience