> For the complete documentation index, see [llms.txt](https://developers.citrusad.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developers.citrusad.com/integration/reference/filtermapping.md).

# filterMapping

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Epsilon Retail Media's documentation is now centralized with our knowledgebase!

For up to date guides, please view [this page](https://help.citrusad.com/retail-media-interface/integration/citrus-filter-mapping-api/filtermapping) in the new Integration APIs space of our documentation.
{% endhint %}

When synchronising products with Epsilon Retail Media, retailers may use internal values for the category and location information.

For example: category\_id:8a\_6b\_vc is the unique identifier for the Beauty category.

Epsilon Retail Media can map these internal values to a human-readable format to display in the UI through the filter mapping API. Advertisers can target campaigns to categories and locations their products are eligible for in an easy-to-understand UI.