Credit card number:

1.

The beginning of 3 is JCB of Japan and AMERICAN EXPRESS of the United States.

2.

The number starting with 4 is the international brand VISA credit card (the world’s number one credit card organization)

3.

The number starting with 5 is international Brand MASTERCARD.

4.

The card starting with 6 is China UnionPay single currency card (or American discover).

CVV code:

The security code of the VISA card is called CVV2 (Card Verification Value 2). It has 3 digits and is printed flat on the signature line on the back of the credit card at the last 4 digits of the card number.

The security code of MasterCard is called CVC2 (Card Validation Code 2). It has 3 digits and is printed flat on the signature line on the back of the credit card after the 4 digits of the card number.

The security code of the Discover Card is called Cardmember ID, which is a 3-digit number and is printed flat on the signature line on the back of the credit card.

The security code of American Express is called CID (Card Identification Number), which is a 4-digit number and is printed flat on the front of the credit card above the credit card number.

The security code of the JCB card (Japan Credit Bureau) is called CAV2 (Card Authentication Value 2). It has 3 digits and is printed flat on the signature line on the back of the credit card after the 4 digits of the card number.

CVV is Card Verification Value, while Mastercard is called Card Validation Code (CVC). VISA CVV and MC CVC are both 3-digit or 4-digit numbers generated from the card number, validity period and service constraint code. They are generally written in the 2-track user-defined data area of ??the card's magnetic stripe.

Technical principles:

1.

The "Visa Verification" service is based on a technology platform called "Three Dimensional Security". The specifications and communication of this technology The protocol is encrypted using the encrypted Secure Connection Layer (SSL) technology, which is now adopted by most online merchants.

2.

The "Visa Verified" service mark will be displayed on the web pages of participating online merchants, and cardholders will also need to enter their personal password when registering and making every online purchase. Appears during verification.

3.

The function of VISA verification is not only to verify the legitimacy of overseas websites, but also to verify the identity of the cardholder, thereby reducing the risk of overseas online shopping being stolen.