Installation guide for Squarespace sites.
Squarespace supports site-wide script injection via Code Injection, available on Core, Plus, Advanced, Business, and Commerce plans. Go to Website → Pages → Website Tools → Code Injection and paste the script tag into the Header field:
<script src="https://cdn.palaceanalytics.com/palace-tracker.js" data-website-id="your-website-id" data-auto-track="true" defer ></script>