Get your snippet
Find it in Settings → Pixel & install in Open Tracked.
Add it to Squarespace
Open Settings → Developer tools → Code injection, paste the snippet in Header and save.
<script async src="https://app.opentracked.io/os.js?k=YOUR_SITE_KEY" data-key="YOUR_SITE_KEY" data-window="30"></script>Code injection needs a Business plan or higher.
Check it works
Open your site. The status in Settings → Pixel & install turns green.
To record sales, see Track purchases.