AVS (Address Verification Service)

AVS checks whether the billing address a customer enters at checkout matches the address the card issuer has on file, helping merchants catch potentially fraudulent card-not-present transactions.

What Is AVS?

Address verification service compares the numeric parts of a billing address, typically the street number and postcode, against the address registered with the card issuer. It returns a match code indicating whether the numeric address, postcode, both or neither matched, which merchants can use as one signal in deciding whether to accept a transaction.

How AVS Works

During checkout, the customer's entered billing address is sent as part of the authorisation request. The issuer compares it against its own records and returns a result code alongside the approval or decline. Merchants can configure their own rules for what to do with different AVS outcomes, such as declining a transaction outright or flagging it for manual review, often as part of a broader fraud detection setup layered on top of 3D Secure and other checks.

Benefits and Limits of AVS

AVS is one of the simplest and lowest-friction fraud checks available for card-not-present transactions, since it happens automatically during authorisation without any extra step for the customer. However, it isn't perfect: address formatting differences, particularly for international transactions, mean legitimate customers can occasionally fail an AVS check, so most merchants treat it as one signal among several rather than an automatic decline.

AVS and Broader Fraud Prevention

AVS works best as part of a layered strategy alongside CVV checks, 3D Secure and behavioural fraud scoring, rather than as a standalone rule. finera.'s payment gateway supports configurable AVS rules as part of a wider intelligent fraud management approach.

AVS Match Codes Explained

AVS responses typically come back as one of several match codes rather than a simple yes or no: a full match on both address and postcode, a partial match on just one, or no match at all. Some networks also return specific codes for cases where the issuer doesn't support AVS checking, which shouldn't be treated the same as a mismatch. Merchants configuring their fraud rules need to decide, in advance, how each of these outcomes should be handled, since treating "not supported" the same as "failed" can lead to unnecessarily declining genuine international customers whose card issuer simply doesn't participate in the AVS scheme.