AVS (address verification)

What is AVS?

AVS, or Address Verification Service, is a payment security check used to compare the billing address provided by a customer with the address held by the card issuer.

AVS is most commonly used in card-not-present payments, such as online checkout, mail order, or phone order transactions. It helps merchants and payment providers assess whether the person using the card is likely to be the legitimate cardholder.

In simple terms, AVS checks whether the billing address entered during payment matches the address linked to the card.

How AVS works

When a customer makes a card payment, the merchant collects billing address details, usually including the street address and postcode or ZIP code. These details are sent through the payment flow to the issuer or card network for verification. The issuer then returns an AVS response indicating whether the submitted address information matches, partially matches, does not match, or cannot be checked.

The AVS result can then be used as part of the merchant's fraud rules, risk scoring, or manual review process.

AVS response codes

AVS does not usually return a simple 'approved' or 'declined' answer. Instead, it returns a response code that describes the address match result.

Common AVS outcomes include:

• full match;
• postcode or ZIP code match only;
• street address match only;
• no match;
• address unavailable;
• issuer does not support AVS;
• AVS check could not be completed.

The exact codes and meanings can vary by card network, issuer, processor, and payment provider.

How businesses use AVS

Businesses use AVS to help detect suspicious card payments and reduce fraud risk. For example, a merchant may approve a low-risk transaction with a full AVS match, send a partial match for manual review, or apply stricter checks when AVS fails together with other risk signals.

AVS is usually used alongside other controls, such as CVV checks, 3D Secure, fraud scoring, velocity rules, device data, IP checks, and transaction monitoring. A failed AVS check does not always mean fraud, and a passed AVS check does not guarantee that the transaction is safe.

For payment teams, AVS can help explain why a transaction was approved, challenged, reviewed, or blocked. It can also support better fraud rule configuration by showing how address mismatches relate to actual chargebacks or suspicious payment patterns.