Part of a transaction response code generates a single letter code in response to the Address Verfication System (AVS) check. Most terminals and POS systems also offer an “AVS Only Check” for verification before the transaction is actually run if a merchant chooses. Here are the definitions of the possible response code characters: –   A — Street addresses matches, but the ZIP code does not. The first five numerical characters contained in the address match. However, the ZIP code does not match.
–   E — Ineligible transaction. The card issuing institution is not supporting AVS on the card in question.
–   N — Neither address nor ZIP matches. The first five numerical characters contained in the address do not match, and the ZIP code does not match.
–   R — Retry (system unavailable or timed out).
–   S — Card type not supported. The card type for this transaction is not supported by AVS. AVS can verify addresses for Visa cards, MasterCard, proprietary cards, and private label transactions.
–   U — Address information unavailable. The address information was not available at the issuer.
–   W — 9 digit ZIP code match, address does not. The nine digit ZIP code matches that stored at the issuer. However, the first five numerical characters contained in the address do not match.
–   X — Exact match (9 digit zip and address) Both the nine digit postal ZIP code as well as the first five numerical characters contained in the address match.
–   Y — Address and 5 digit zip match. Both the five digit postal ZIP code as well as the first five numerical characters contained in the address match.
–   Z — 5 digit ZIP matches, but the address does not. The five digit postal ZIP code matches that stored at the VIC or card issuer’s center. However, the first five numerical characters contained in the address do not match. FOREIGN CODES:
–   B — Street address matches for international transaction. Postal Code not verified due to incompatible formats.
–   C — Street address and Postal Code not verified for international transaction due to incompatible format.
–   D — Street address and Postal Code match for international transaction.
–   P — Postal Code match for international transaction. Street address not verified due to incompatible formats.

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