I've also successfully tested a nice way to catch thieves trying to buy via my icart with stolen Credit Card. Once I have some time I will implement for registration. You give them a list of country where they are for them to select. Then you create a function to grab country from IP. if they don't match then you stop them. Recently a fraudster with a Canada IP made a purchase with a Credit Card from France. Of course he got caught. 2 days later the legitimate credit card owner filed an unauthorized claim.
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