RFID access control

Hello Guys !

I'm currently working on a projekt entitled access control for elevators and I managed to come around a code which control the access with a master card using the arduino EEPROM, I want to upgrade my projekt with an android app using bluetooth that manages to grant or deny access based on RFID tags Any ideas how I can come around it ?? your help is appreciated thank you !

come on guys any suggestions would be very helpful