is a refund.

in one case, you paid for something with a credit card at that time, and then returned it, so the payment will be returned to your credit card. If it is on the same bill as the transaction at that time, it can be directly offset.

In addition, you have purchased duty-free goods abroad and applied for tax refund. After returning to China, overseas merchants will give you tax refund, which is usually returned to your credit card.