UnionPay is China’s first financial-level pre-authorisation service for secured transactions. The system allows payment for online shopping at any merchant that accepts UnionPay. UnionPay is the National Bankcard Association in China and is thought to be the fastest growing card scheme in the world. It is also the only interbank network in China that links all the ATMs of all banks throughout the country. UnionPay is the third-largest payment network by processed value after Visa and MasterCard