How can I make sure the customer's credit card is valid?

You can enable Risk Tools and set CVV (Card Verification value) Rules to flag orders with invalid AVS and CVV responses. For more information on Risk Tools see the Risk Tools Help pages.

If you are uncertain whether an order is genuine, you can contact your merchant account provider who can provide contact information for you to call the issuing credit card bank who can then verify the card information before you process the order.

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