If you have any question left, please drop a note with the discussion link of this page.

From Wiki.zanox.com

Discrepancies in statistics can occur for a number of reasons: zanox only credits you with clicks if these are declared as valid according to their URL checking status. The URL checking status is assigned by the merchant operating the programme. The IP, the cookie and the referer are checked. By default, the merchants paying for the clicks assign a URL checking status of "2". This means we will only validate clicks that send a referer containing the registered domain (ad space). Furthermore, clicks issued from one computer within a specified timespan are counted as only one click.

Statistical discrepancies may also occur when the image call contained in the zanox tracking code does not reach our servers. This happens when the call is buffered in a proxy server. In such cases, the proxy server returns the result in question without querying our servers again. There is one simple way to address this problem: integrate a timestamp variable into the tracking code supplied by us. (Note, however, that your system may not support this.) The timestamp ensures that each time the page is called, a new unique value is created that has not yet been buffered in a proxy server. If you are working with an ad server, you can also use the server's timestamp variable.

Example

Tracking code without timestamp

http://www.zanox-affiliate.de/ppc/?12345C67890T

http://www.zanox-affiliate.de/ppc/?12345C67890T&ULP="www.domain.com/..."

Tracking code with timestamp (xxxxxx signifies the ad server's timestamp variable)

http://www.zanox-affiliate.de/ppc/?12345C67890Txxxxxx

http://www.zanox-affiliate.de/ppc/?12345C67890Txxxxxx&ULP="www.domain.com/..."

You can also use the milliseconds that have elapsed since 01/01/1970 (UNIX start date) as a static numerical counter for timestamping. These can easily be generated with a small Java script. Tracking code with timestamp and JavaScript:

<!-- START of the zanox affiliate HTML code -->
<!-- ( To ensure it works correctly, please do not alter the HTML code! ) -->
<script language="Javascript">
var now = new Date().getTime();  document.write("<A HREF=\"http://www.zanox-affiliate.de/ppc/?xxxxxCxxxxxT" + now + "\">");
document.write("<IMG SRC=\"http://www.zanox-affiliate.de/ppv/?xxxxxCxxxxxT" + now + "\"></A>");
</script>
<noscript>
<A HREF="http://www.zanox-affiliate.de/ppc/?xxxxxCxxxxx">
<IMG SRC="http://www.zanox-affiliate.de/ppv/?xxxxxCxxxxx"></A>
</noscript> 
<!-- END of the zanox affiliate HTML code -->