Many users use China Merchants Bank's credit card, but in the process of using it, there will be various problems, the most annoying of which is the failure of China Merchants Bank's credit card. So, what is the reason? This article will bring you the big secret of the failure of China Merchants Bank credit card swiping. There are several reasons for the failure of China Merchants Bank's credit card swiping: First, remind you that the magnetic stripe on the back of the card may be demagnetized or the card has been damaged. After this happens, you need to go to China Merchants Bank to get a new card. Second, the line used by the card reader is busy or faulty, which has nothing to do with your CMB credit card, but mainly the problem of the card reader. In case of this problem, I suggest you wait for a while and try again or prepare a credit card from another bank. Third, the issue of quotas. Maybe your credit card limit of China Merchants Bank is not enough, and the money you brush far exceeds your credit card limit. In this case, the card will also be invalid.