That is to say, your credit card is currently unavailable

So you must take your credit card and ID card to a bank branch to check. What is the reason for this unavailability? status.

Machines are also prone to risk control. When risk control is applied, some machines can swipe the card normally, but the account cannot be credited until the risk control is released. The card can be swiped normally, but the credit card will have to wait for your credit card to be credited. Just give it up. There is also a situation where you are not directly allowed to trade, and the machine prompts you for a risky transaction. Then at this time, we contact our own POS machine installation agent to ask what the situation is and what needs to be provided to solve it.