external gateway

Hi Sir

If I use below:

Code: ( asp )
theMainURL =
"https://4tknox.au.com/cgi-bin/the­ merchant.au.com/ecom/external2.pl"­

theParams = "LOGIN=xxx/xxxx&COMMAND=purchase&A­ MOUNT=" & CreditAmount&
"&CCNUM=" & CreditCard & "&CCEXP=" & CreditExpiry & "&COMMENT=" & CreditComment

Dim xmlhttp

Set xmlhttp = Server.CreateObject("MSXML2.XMLHTT­P")
xmlhttp.Open "POST", theMainURL, false
xmlhttp.setRequestHeader "Content-Type", "application/x-www-form-urlencoded­ "
xmlhttp.send theParams

Response.write xmlhttp.responseText

The question is how can I get return values and insert in SQL, if gateway result is "failed", "declined" or "Approved"

Thank you.