It is illegal to do so if you have not bought a PSN card, entered the code on the back, and downloaded it through the PlayStation Store.
The code on the back of a credit card is called the CVV (Card Verification Value) or CVC (Card Verification Code).
PSN codes could be the code you get when you buy a pre-paid PSN card, you scratch off the back to find the code. Or they could be codes for games, sometimes you can buy a game in the form of a card with a redeemable code, or in the case of Crossbuy for PS3, a code to redeem on the PSVita.
on the back of the card real code (example) P3NCKRWNXP unused
The 3-digit code on the back of a credit card is called the CVV (Card Verification Value) or CVC (Card Verification Code).
The three-digit code on the back of a credit card is called the CVV (Card Verification Value) or CVC (Card Verification Code).
I think asking for a code is cheating and inappropiate.
Back of the card
The VIP code on the credit card is located at the back of the credit card.
on the back of the card + you have to buy cards
APAE-31D0ADFE is the AR code and on the card? it is at the back of the card OK.
No, their is not a memory card for the ps3.