If you have the UnionPay logo on your RMB credit card (no matter what domestic bank), merchants who spend money in Hong Kong can definitely use it. Generally, you need to enter a password and sign it, and deduct it immediately according to the current quotation. If you use a foreign currency card of a domestic bank, you don't need to enter a password and sign it to deduct money in foreign currency. Generally, sogou, Martha and other large department stores should be able to use UnionPay cards, and the shops in Harbour City will depend on whether the UnionPay logo is affixed. Not only does CCB need to enter a password for debit cards, but Longka dual-currency international credit cards can also provide the service of entering a password according to the needs of users. The international practice is to sign.
Most big stores in Hong Kong have POS password input devices, so you can use them with confidence. Those who hold the above-mentioned dual-currency credit cards in US dollars and RMB will not be converted into RMB according to the exchange rate of UnionPay RMB against Hong Kong dollars, but will be converted into US dollars according to the exchange rate of Hong Kong dollars against US dollars organized by MASTER or VISA on the same day, and will be repaid directly in US dollars or paid in RMB according to the published foreign exchange rate after returning home.