Dollar credit cards are used for specific wild card POS(VISA, MasterCard, Amex and DinersClub logos). Foreign cards are provided with counter services by banks contracted by international organizations.
The USD account can be spent in USD within the credit line of the issuing bank, resulting in bill repayment. China Merchants Bank's credit card has dual currencies of RMB and USD, and besides the UnionPay logo, there are also the logos of overseas credit card organizations on the card surface. Dual-currency card can easily choose the bank with the logo of credit card organization to spend abroad.