Help in RFID Sensor

Hi, what function I need to use to let the RFID sensor read data I will already have the address for the Rifid chip I just want to what to know the function I need to use I want to make a statement if the card has the same address continue else to do something and break. I just want the RFID sensor to read and store the data somewhere

What RFID sensor? Where is somewhere?

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