Address Verification Service (AVS)
A fraud prevention tool that compares the numeric portions of a billing address provided during a transaction against the address registered with the card-issuing bank, returning match result codes to help merchants assess transaction risk.
Address Verification Service (AVS) is primarily used for card-not-present transactions such as online, phone, and mail orders where the physical card cannot be verified. During transaction authorization, the payment gateway or processor submits the street number and ZIP/postal code to the card network, which queries the issuing bank for the registered billing address. The system returns an AVS response code indicating full match, partial match, no match, or unavailable, allowing merchants to accept, decline, or review transactions based on configured risk rules.
Common AVS response codes include Y (full match on street address and ZIP code), A (street address matches but ZIP does not), Z (ZIP matches but street address does not), N (neither street address nor ZIP match), U (address information unavailable), and R (retry/system unavailable). International transactions may return different codes as AVS functionality varies by country, with full AVS support primarily available for cards issued in the United States, Canada, and the United Kingdom.
Using AVS provides multiple benefits for card-not-present merchants. AVS verification helps qualify transactions for lower interchange rates, as many card network interchange categories require AVS matching for preferential pricing. AVS also serves as a fraud screening mechanism, allowing merchants to flag or decline transactions with address mismatches that may indicate fraudulent use. However, AVS has limitations including legitimate scenarios where addresses don't match (such as corporate cards, recently moved cardholders, or gift recipients), international address format inconsistencies, and the fact that AVS only verifies numeric portions of addresses, not full address accuracy.
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