# AVS codes

The [Address Verification Service (AVS)](https://www.checkout.com/docs/business-operations/prevent-fraud/address-verification-service.md) is a fraud prevention tool that issuers automatically apply to payments to verify that the customer is genuine.

It performs an AVS check, which compares the billing address provided by the customer with the address on the payment card.

You receive the result of AVS checks as AVS codes. AVS codes describe whether there was a full or partial address match, or a mismatch.

You can receive the following AVS codes:

| AVS code | Scheme(s) | Description |
| --- | --- | --- |
| `A` | American Express, Mastercard, Visa | Partial match. <br>The street address matches, but the ZIP code or post code does not. |
| `B` | Discover, Visa | Partial match. <br>The street address matches, but the ZIP code or post code could not verified, likely due to incorrect formatting. |
| `D` | Visa | Full match. <br>The street address and the ZIP code or postal code match. |
| `E` | N/A | AVS system error. |
| `G` | Discover, Visa | The issuing bank is international so the address and the ZIP code or post code could not be verified. |
| `I` | Visa | The address could not be verified. |
| `M` | Visa | Full match. <br>The street address and the ZIP code or postal code match (international only). |
| `N` | American Express, Discover, Mastercard, Visa | No match. <br>The street address and the ZIP code or post code do not match. |
| `O` | American Express | The address could not be verified. |
| `P` | Discover, Visa | Partial match. <br>The ZIP code or post code matches, but the street address could not be verified, likely due to incorrect formatting. |
| `R` | American Express, Discover, Mastercard, Visa | The service is unavailable. Retry the AVS check. |
| `S` | American Express, Mastercard | Not supported. |
| `U` | American Express, Mastercard, Visa | The address was not verified due to lack of issuer support or system malfunction. |
| `W` | Mastercard | Partial match. <br>The ZIP code or post code matches, but the address does not. |
| `X` | Discover, Mastercard | Full match. <br>The nine-digit post code and corresponding address match. |
| `Y` | American Express, Discover, Mastercard, Visa | Full match. <br>The five-digit post code and corresponding address match. |
| `Z` | American Express, Mastercard, Visa | Partial match. <br>The five-digit ZIP code or post code matches, but the street does not. |
| `AE1` | American Express | The cardholder's name is incorrect, but the ZIP code or post code matches. |
| `AE2` | American Express | The cardholder's name is incorrect, but the street and ZIP code or post code match. |
| `AE3` | American Express | The cardholder's name is incorrect, but the street matches. |
| `AE4` | American Express | The cardholder's name matches. |
| `AE5` | American Express | The cardholder's name and the ZIP code or post code match. |
| `AE6` | American Express | The cardholder's name, street, and ZIP code or post code match. |
| `AE7` | American Express | The cardholder's name and the street match. |