International banks in Shenzhen
When first arriving in Shenzhen, whether from Hong Kong or abroad, you will notice your standard home banking ATM card won’t work in any of the domestic banks. This is due to the fact that the Chinese banking system runs on its own “System” and not the international standard of Visa, Maestro, Cirrus, or PLUS. The China system is the Chinese version of “Union Pay” (This is also different to the Hong Kong “Union Pay” System).
This article uses material from the Wikipedia.