A unique tracking number, the Hit ID, is created by HitPath and passed to the advertiser in the URL. The advertiser then passes the Hit ID back through the sale pixel, which links the sale back to the click.
Conversion is linked back to the click through cookies stored on the user's browser.
Generally it is a 1x1 pixel because it is the smallest unit of measure on a webpage. When the page loads and the html is rendered the pixel “fires”.
HitPath offers the preferred method: database tracking and a backup method, cookie tracking.
Database tracking lets you account for every sale, regardless of the user's settings.
Now, when the pixel is fired, we need a little bit of information in order for the HitPath system to be able to track it. The information we need is really simple - just a 9 digit tracking number we call a "hit ID" that is unique per each user. We can get the Hit ID one of two different ways. We can either get that number by reading it from the cookie we dropped when the affiliate link was clicked or we can get that number by passing it in the landing page URL and having the advertiser insert some extra code on their end that let's the pixel read it from the URL.