MasterCard, Visa, UnionPay Network. According to China Economic Net, as a bank approved by the China Banking Regulatory Commission, the full-currency credit cards issued by the Postal Savings Bank can be used on MasterCard, Visa, and UnionPay networks worldwide. At the same time, it can also be used on other domestic networks such as Alipay and WeChat Pay. It should be noted that there may be certain differences in the usage range of different credit cards. For specific information, you can consult Postal Savings Bank customer service or check the usage instructions of the relevant credit cards.