If it is a dual-currency credit card, the tax refund will be returned to the US dollar account, then a US dollar premium will be formed. Cardholders can keep it in a US dollar account for future use. If you don't have the opportunity to use US dollars, you can call customer service and transfer the overpaid US dollar tax refund to the RMB account of the same credit card.
If it is a single currency credit card or a full currency credit card, it will be automatically converted into RMB.