Documentation

Shopify installation guide

1. Duplicate your active theme as a backup. In Online Store → Themes, open the active theme's menu and choose Edit code.
2. Open layout/theme.liquid. Paste the per-site script snippet once before the closing head tag, then save. Avoid duplicating an app/GTM installation.
3. Preview the change, publish the theme and visit your public storefront after required consent. Verify installation in AnalyticFast.

Theme code covers storefront pages. It does not automatically instrument Shopify's hosted checkout, checkout extensions or customer-account surfaces. Do not promise purchase attribution from a storefront click. Connect a supported revenue integration or a server order hook with attribution metadata using your own checkout integration. This workstream does not provide a Shopify app or pixel extension.

Official references, checked 2026-10-26: Shopify theme code, theme layout.