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A US registered credit card is one whose billing address is in the US. I am a credit card merchant myself, and when I sell a product online I'm required to check that the shipping address for the product matches the billing address for the card, as a protection against people trying to use stolen credit card details. I can't find out what the card's billing address is, but the software I use to authorise a credit card transaction tells me whether or not the address the customer has supplied is valid for that card.
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