UnionPay is an enterprise in China, and it is a platform to provide solutions for inter-bank capital flow after the national banks reach an agreement. Taiwan Province Province implements the policy of one country, two systems, so it is normal for Taiwan Province Province not to use UnionPay in China. However, in order to solve the problem of capital circulation between banks, he should choose a global solution like VISA.

This is the answer. If he asks why Taiwan Province Province doesn't use it, he can talk about one country, two systems! Hmm. How interesting