Perhaps paying in different currency makes a difference in total amount?
As far as I’m aware, all our bills to Pimax in China are in US dollars, but naturally, many of us aren’t in America.
I live in the UK and could pay dollar or pounds sterling (UK currency) at checkout. I chose dollars as my bank claims not to pay a surcharge for paying in dollars.
For people who forget and use their local currency to pay Pimax, what might happen is this may increase your total cost for paying Pimax, as subsequently your bank might charge you a ‘currency conversion fee’ for and this will also vary depending on country you live in also.