As far as I know, the foreign exchange fee for MasterCard of China Merchants Bank is 1.5%. Then if you take the M-line brush 1000HKD, you will need an exchange fee of about $2 at the moment when you change it into your US dollar bill. But the most troublesome thing is that this dollar bill needs you to apply for foreign exchange purchase repayment (of course, you can also apply for automatic foreign exchange purchase repayment at one time). On the contrary, if you take the UnionPay line, the RMB bill will come out, which will be more convenient and affordable!
Take today's foreign exchange quotation of China Merchants Bank for a comparative calculation. For reference only!
Take the M line to charge: HK$-USD; Repayment method: USD-RMB
Exchange rate: 1 HKD =0. 1290 USD, 1 USD =6.7044 RMB (the selling price of China Merchants Bank in USD).
Then the bill is: 130.94 USD (including 1.5% handling fee), and the final repayment amount in RMB is 877.87 RMB.
UnionPay pays directly in RMB and generates RMB bills.
Exchange rate: according to the foreign exchange selling price of RMB announced by the state on the trading day (100 HKD =86.4 1 RMB).
The final repayment amount of RMB is 864. 1 yuan.