Precautions using Credit or Debit card are : (a) Do sign your debit/credit card at the back on the place below the magnetic strip. (b) CVV (Card Verification Value) is a numeric code given at the back of the card. Always erase the 3 -digit CVV number on the backside of the card. Memorize it for your use and do not shared with any one. (c) PIN (Personal Identification Number) is a numerical password which should not be share with anyone not even with the bank officials.