If you do not wish to track impressions, navigate in your merchant panel to Configuration > Banners & Links Formats. In the "Select Banner or Link" section, click on each format, remove the {$impression_track} variable from each format's code, and save the format.
From now on the impression tracking script won't be included in links & banners generated in the affiliate panel.
The already published links & banners on the websites of affiliates will have to be either replaced with the re-generated banner codes found in their affiliate panel, or the affiliates can manually remove the following part from the code of already published links & banners to not track impressions.
<img src="https://mycompany.postaffiliatepro.com/scripts/imp.php?a_aid=testaff&a_bid=11110001" width="1" height="1" border="0" />