Even if the credit card company has given the authorization as to the validity of the card, there are several ways fraudulent cards can be used on your site. The card may have been lost or stolen, but the card owner is yet to report its loss. Or the number on the card (and not the card itself) may have been lifted without the knowledge of the owner. There is also a scam called identity theft, where the card has been issued under false pretenses using someone else's identity and data.
As an online merchant, you need to have a system to check the authenticity of orders placed to safeguard your business. While the effort may require additional time and money, it can save you the cost and stress caused by charge-backs for fraudulent orders. You lost your physical products; you lose the sale price; you lose another business opportunity; and you will be fined an additional $15-$50 charge-back fee.
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