Site Token
From Apture Wiki
The Site Token is a 7-character sequence included in the Apture Script that identifies your specific Apture-enabled site.
When you register a site domain with your Apture Account, we create a site token specific to that domain. When manually adding the Apture Script to your web site, be sure that you are adding the Apture Script that was generated specifically for that site. Adding an incorrect Apture Script to your site will not enable Apture.