> ## Documentation Index
> Fetch the complete documentation index at: https://docs.gvb-staging.co.uk/llms.txt
> Use this file to discover all available pages before exploring further.

# Includes

> Request supported related data without extra calls.

Use a comma-separated `include` query value only where supported:

* Catalog vouchers: `categories`, `variants`
* Catalog categories: `products`

For example, `?include=categories,variants`. Other collection endpoints do not support includes; unsupported values return `422`.