You only need one tracking code and you only need to implement it once on your websites.
You implement Sleeknote on different websites by adding the tracking code you find in the Navigation (to the left when you are logged in).
When you have added the tracking code on the specific site, you create a campaign and paste in your domain for that site in step 1 'Setup' (when you create your campaign).
This way you can have different campaigns on different websites when you have added your tracking code to the sites.
Regardless how many campaigns you want to use - you only need a single tracking code.
We link the website and campaign together based on the URL entered in the first step of creating a campaign, and we make sure the proper campaigns are shown on the proper websites.