Address Verification Service is provided by the card associations and banks, and it lets a merchant validate a billing address against the issuing bank's records during authorization. It only checks part of the address — typically the first four to five digits of the street address and the ZIP code. For "1234 USA Street, Realtown, ST 56789," only "1234" and "56789" actually get verified.
What comes back
AVS returns one of six response codes: full match, partial match on address, partial match on ZIP, no match, international, or unavailable. In practice, 40–80% of orders land on a full match.
Why treating it as pass/fail is a mistake
The highest fraud rate ever documented for any single AVS response code was only 11% — meaning even a "no match" is still mostly good orders. Merchants who reject on any AVS mismatch have been shown to decline 5–28% of legitimate orders. Mismatches happen for ordinary reasons: someone moved, the bank's records are stale, or it's a gift being shipped somewhere else entirely.
How to actually use it
AVS works best as one signal in a broader review, not a gate on its own — use it to prioritize which orders get a closer look, and keep it on hand as evidence if a chargeback dispute comes in. Implementation is fast, typically 1–7 days, but needs explicit logic for each response code rather than a blanket accept/reject rule.