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

# Welcome

Welcome to the Common APIs — concepts and reference data shared across our [Affiliate](https://developers.elocal.com/affiliate-apis) and [Advertiser](https://developers.elocal.com/advertiser-apis) integrations.

## What's inside

* <i class="fa-key">:key:</i> [Authentication](/getting-started/authentication.md) — how to obtain and use API keys.
* <i class="fa-list">:list:</i> [Lookup APIs](/getting-started/lookup-apis.md) — discover IDs for categories, geographies, statuses, and more.