If there is no problem, there may be a problem with the platform system and you need to consult customer service.
Precautions for using credit cards:
1, the credit card withdrawal rate is high.
Because the credit card itself has no money, if you withdraw cash by credit card, it is equivalent to borrowing money from the bank, and the interest is very high, and it is calculated on a daily basis (the specific interest calculation method can be understood from the issuing bank). Don't withdraw cash unless you have to.
2. The credit card has no password.
If the credit card has a password, you need to enter the password when swiping the card. If there is no password, just sign to confirm the consumption. Maybe you think it's not safe to set the password, but it's not right, because the merchant has the obligation to check your signature. If someone else spends money with your signature, the responsibility is not yours, and the bank needs to compensate you for the loss. If you use a password to spend money, the merchant is not responsible for the theft of the credit card.