There is no handling fee for using UnionPay card. But the premise must be that merchants can brush UnionPay cards. You can also withdraw money from an ATM marked UnionPay. There is a handling fee for this. How much depends on the charging standard of the bank where you apply for the card. UnionPay credit cards are generally better than visa and master. Because an exchange rate will be better, it will be settled at the domestic exchange rate of the day. The other two are settled at their own exchange rate, first in US dollars and then in NT dollars, so there will be some exchange rate losses.