It’s difficult to find the right balance between over-zealous rejection of genuine business and losses from a lax approach. For instance, AVS will give up to 40% false negatives, due to the variety of address formats used by people, and AVS cannot be used on overseas orders. So AVS should only be used as one of several fraud indicators. Also, your business will turn out to have its own fraud profile, so using your own experience to develop specific policies is the best way to get this balance.
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