> For the complete documentation index, see [llms.txt](https://docs.sizebay.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.sizebay.com/size-and-fit-data-integration.md).

# Size & Fit Data Integration

- [Product Integration (XML Feed)](https://docs.sizebay.com/size-and-fit-data-integration/product-integration-xml-feed.md): This document provides guidelines for structuring your store's Product Feed (XML) to be integrated with Sizebay services.
- [Product Integration (API)](https://docs.sizebay.com/size-and-fit-data-integration/product-integration-api.md)
- [Product Integration (OnPage)](https://docs.sizebay.com/size-and-fit-data-integration/product-integration-onpage.md): Sizebay registers products from HTML pages via a lightweight JavaScript embed. When a visitor lands on a product page, the script reads and registers it in real time.
- [Product Integration (Shopify)](https://docs.sizebay.com/size-and-fit-data-integration/product-integration-shopify.md): This page provides an overview of how product integration via API works on Shopify, highlighting key concepts and important points to consider.
- [Return Data Integration (CSV)](https://docs.sizebay.com/size-and-fit-data-integration/return-data-integration-csv.md): The return data helps our algorithm learn and enhance the recommendations for your customers.
- [Return Data Integration (API)](https://docs.sizebay.com/size-and-fit-data-integration/return-data-integration-api.md): This endpoint allows partners to send one or multiple product return records to Sizebay.
- [Product Variants Integration](https://docs.sizebay.com/size-and-fit-data-integration/product-variants-integration.md): We now allow you to integrate multiple variants of your product, from images to even color palettes.
- [V1](https://docs.sizebay.com/size-and-fit-data-integration/product-variants-integration/v1.md): 1.0.0-BETA, 1.0.0, 1.0.5
- [Categories accepted by the Integration](https://docs.sizebay.com/size-and-fit-data-integration/categories-accepted-by-the-integration.md): In this document, we'll be dissecting the categories that are accepted by the Integration methods available by Sizebay.
- [Size Tailor](https://docs.sizebay.com/size-and-fit-data-integration/size-tailor.md): Improve your store integration with Sizebay even further by extending the user measures experience.