The poster will give you a few tips to prevent such problems from occurring.

First of all, you must keep the card information, card number, validity period, query password, and CVV2 code. With just these pieces of information, others can use your card to pay easily online. Therefore, the card face cannot be easily seen by people around you. Although others don't know the query password, if you set it with birthday, phone number, etc., others may easily crack it.

Then you can log in to the China Merchants Bank website. I don’t need to tell you the URL. Log in to credit card online banking with your ID number and query password. No registration is required. After entering, you can modify the card limit and the online payment limit. The card limit is the limit available for the card, which can be set arbitrarily within the range of the credit limit. The online payment limit is used alone to control online consumption. For example, the card limit is adjusted to 10,000 (provided that your credit limit is greater than or equal to 10,000), and the online payment limit is adjusted to 1,000. In this way, you can spend 1,000 by swiping the card in the mall, but you can only use 1,000 when shopping online. . It can prevent the risk of fraud to a great extent. You can modify it yourself when you need to pay large amounts online.