if you want to return it, first look at how this overpayment is formed. for example, if you used RMB to purchase foreign exchange for repayment after swiping your card, but then the merchant refunded it, and there is RMB arrears in your account, you can settle the foreign exchange and return the overpayment to your credit card RMB account.

if you haven't purchased foreign exchange, you will pay more dollars when you repay it, or you will have more dollars on your card because of the refund. In this case, you can refund the US dollar overpayment, and provide the local and foreign currency all-in-one savings account of CCB in my name, and you can refund the overpayment to your card for free.

you don't have to be so clear. You can call the customer service hotline for details, and the customer service will give you a specific solution.