nissan micra 1.0 5dr visia 2003 radio code

[lisa b]

hi i have a nissan micra 1.0 5dr visia 2003 and i need the radio code, i bought radio removal keys but only the front comes off, i have a bar code number, a 10 digit number followed by index and a 12 digit number but no BP anywhere, i dont now which one is the serial number and can someone recommed a code retreval site. thanks