Credit Card!! I'm desperate for some help!

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I really hope someone here can help me. I've just started setting up my Shopify cart and I'm now trying to register my Credit Card for the comission payments. For what ever reason when I enter the card info all I get it "Error Invalid Card Details" (or something to that effect). However I know there isn't a problem with the card, so whats the problem? Is it because its a UK credit card? Thanks Lee