The tracking pixel is going to let you know how well your automation is doing and automatically records stats from page views on your website that it generates.
In Uscreen head to Customization and select Advanced > Code Snippets.
In the Head Code Snippet section paste in the first script which will apply to all pages in your Uscreen storefront and then paste in the thank you page snippet into the Purchase Code Snippet area.
Now back in Leadzen you'll start to see the stats for this automation populate as visits are made.