The exchange rate of UnionPay is constant every day, that is to say, when you spend money, you can exchange it according to the exchange rate of UnionPay on that day and directly enter it in RMB, so the risk of exchange rate changes after that has nothing to do with you. It should be noted that the UnionPay exchange rate is released at around 10: 00 every morning, and the exchange rate of the previous day is still used before the release. So some people swipe their cards that day, but the exchange rate is different, mistakenly thinking that the exchange rate is changing in real time.