At present, visa cards of all banks can be used abroad (of course, it is not a problem to buy air tickets in China). Visa cards are all settled in US dollars. If the Philippine currency is freely convertible, it is to pay the Philippine currency in US dollars first, and then you can return the RMB to US dollars (if you have US dollars, you can of course return the US dollars directly). This has nothing to do with bank cards, but with the country's foreign exchange policy.

However, if you often shop on foreign websites, it is recommended to use China Merchants Bank, because the credit card service of China Merchants Bank started early, the use restrictions are few, and the customer service attitude is better (don't run to Bank of China, because the Bank of China card can't even brush a large shopping website like Amazon. I personally understand that it is to guard against foreign exchange risks! )

There is always a difference in exchange rate between the conversion of various currencies, because there is always a gap between the buying price and the selling price of foreign exchange. Bank of China is the bank that announces the exchange rate. Of course, the exchange rate loss is relatively small, but according to my experience, as long as it doesn't cost hundreds of thousands, the difference can be ignored. Hundreds of thousands of dollars, there may be a gap of several hundred dollars between different banks. If I spend thousands of dollars every month, using China Merchants Bank is at most a few dollars more expensive than Bank of China.