Why do credit card numbers need to be raised?

The ridges on credit card numbers were originally used for rubbing. This type of information is called Emboserdata (embossed data), because early POS machines could only confirm transactions by using the card's raised information on carbon paper such as blue printing paper as the cardholder's credit card credential. Therefore, with the help of these protruding information, the user's identity can be confirmed → the transaction can be completed → the document can be formed. The "dashed line" on the UnionPay logo is not a dotted line, but information composed of microtext.

The microtext includes: the Chinese pinyin abbreviation of "UnionPay", the code of the issuing bank (including the Postal Savings and Remittance Bureau), the card type code, and the manufacturer code. These words require a magnifying glass to be seen clearly, and are difficult for ordinary users to see clearly with the naked eye.

There is a big difference between a co-branded card and an endorsement card. In fact, the distinction between the two is very simple. The co-branded cards are usually for-profit organizations, such as China Southern Airlines co-branded cards, shopping mall co-branded cards, etc. The partners of recognition cards are usually non-profit or non-profit organizations, such as Baidu Tieba recognition cards, etc., just to attract specific user groups.

They are both security codes, but the abbreviations are very different. The security code is the last three digits on the signature line on the back of your credit card. Different card issuing organizations have different abbreviations for security codes. The UnionPay standard card organized by UnionPay is called CVN2, the MasterCard card is called CVC2, the VISA card is called CVV2, and the AE Express card is called CSC2. The most commonly used one is the CVV2 code, which is the security code of the VISA card.

Back signature cannot be ignored. The importance of credit card signatures is no less important than passwords and security codes. When making purchases overseas, if the credit card is not endorsed, it cannot be used. It needs to be emphasized that the back signature cannot be altered or signed incorrectly, otherwise the card will be invalid. Generally, in order to maintain the lasting beauty of the signature, the staff will recommend that you use a ballpoint pen to complete the back signature.