QR code based Fuel Dispensing System

IOT project done with help of ESP 32, camera module, GSM Module. Basically a person enters a fuel station holds the QR code in the mobile phone into the cam module and it identifies the person and a password is required to be entered by the user for verification. then the amount needed to pumped is entered through a keypad module and the nozzle is taken by the customer and pumped with help of a solenoid valve to the car. Then a message should be generated as the pumped amound and remaining amount of quota with the balance in the account of the person. BTW the accounts should be in a database of users where the payments should be recorded in the database realtime and the customer should be able to top up his/her account with a unique ID provided to them.