title: Address Verification System (AVS) ) Check for eCommerce
body: <p>My company is using the Stripe API to process credit cards.  Stripe offers Zip code and Address Verification System (AVS) checks.  AVS checks the street number the user entered against the street number at the issuing bank.</p>
  
  <p>Stripe returns one of three results:  PASS, FAIL, and UNCHECKED.  Unchecked means the bank does not support this feature.  </p>
  
  <p>So, the question becomes whether to accept only payments that PASS or to reject only payments that FAIL.  I would prefer to be more conservative and only accept payments that PASS, but I would like to first know how many potentially good customers that might be "unchecked".</p>
  
  <p>My question:  What percentage of US based credit cards, processing in US dollars, through only Visa or MasterCard don't check AVS?  A range is fine (ie. 5-10%)</p>