I have a Mastercard from a Chinese bank and this card is for payments only in GBP. However every time I use paypal for my payments, paypal converts the money into CNY so on my bank statement the amount of money is always higher than what I'm supposed to pay just because it's been converted twice. Sometimes I have an option to change my payment currency but sometimes I do not (for example when I was paying for trainline just now) and it really annoys me. How can I change the default currency of this card?
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