# Page Not Found

The URL `main-littledata-app/headless-shopify/upgrading-to-the-advanced-tracking-script` does not exist.

You might be looking for one of these pages:
- [Upgrading to the Littledata Pixel](https://help.littledata.io/integrations/headless-shopify/upgrading-to-the-advanced-tracking-script.md)
- [Headless or Shopify Hydrogen store installation](https://help.littledata.io/integrations/headless-shopify/working-with-a-headless-shopify-setup.md)
- [How server-side tracking works](https://help.littledata.io/integrations/shopify/how-server-side-tracking-works.md)
- [Migrating to Shopify’s extensible thank you and order status pages](https://help.littledata.io/advanced/troubleshooting/migrating-to-thank-you-page.md)
- [Opting in to Beta testing](https://help.littledata.io/advanced/troubleshooting/opting-in-the-beta-testing.md)

## How to find the correct page

1. **Browse the full index**: [/sitemap.md](https://help.littledata.io/sitemap.md) - Complete documentation index
2. **View the full content**: [/llms-full.txt](https://help.littledata.io/llms-full.txt) - Full content export

## Tips for requesting documentation

- For markdown responses, append `.md` to URLs (e.g., `/integrations/headless-shopify/upgrading-to-the-advanced-tracking-script.md`)
- Use `Accept: text/markdown` header for content negotiation