---
title: Pairing
description: How to map categories to products for Luigi's Box Product Listing.
slug: product-listing/guides/pairing
docKind: guide
hub: product-listing
---

To use product listing, you need to provide a mapping between categories and products. The default mapping used in our services is `id -> category_id`. This means that we expect your category object to contain the attribute `id`, and your product object to contain attribute `category_id`. The default mapping cannot be changed by you, but if you wish to change it, please contact our support at [support@luigisbox.com](mailto:support@luigisbox.com).

If you try to integrate a product listing while using invalid mapping, you will see an error message saying `Error creating query - invalid category attribute` or `Could not find attribute <attribute_name> in your category structure`.