As long if it's a visa card
I wonder if that is a question that you should ask your UK creid card company?
I don't think so. The other day was an Australian lady buying something and she end up paying in cash.
Not know
I would assume so, as I use my canadian one in America. And I know I use my walmart all over the world. It must depend who the bank is with Mastercard, Visa, amex etc
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