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

# Reference Data

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Use this section for stable reference data reused across integration flows.

Start here when you need to:

* confirm a shared request value before implementation
* check a reusable enumeration or lookup value
* find a supporting reference page used by multiple workflows

### FAQ

#### What is Reference Data used for?

Use this section for stable shared values and lookup data reused across Atlas API flows.

#### When should I open Reference Data instead of a workflow page?

Open Reference Data when you already know the workflow and only need the supporting value, enumeration, or lookup data.

### Pages in this section

* [Locale Reference](/api-document/support-and-reference/integration-reference/reference-data/locale.md)

### What this section covers

* Shared request values
* Airline-specific enumerations
* Supporting lookup data

### Use this when you need

* A supported request value
* A reference list reused across flows
* A lookup page used by multiple guides or APIs

### What comes next?

After you confirm the reference value, return to the guide or endpoint page where that value is used.