> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://ups.ferndocs.com/api-reference/customs-detail/field-data/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://ups.ferndocs.com/_mcp/server.

# Field Data


## API Docs

- Field Data [Returns required custom details](https://ups.ferndocs.com/api-reference/customs-detail/field-data/get-custom-detail-data.md)
- Field Data [Validate and/or submit the fields](https://ups.ferndocs.com/api-reference/customs-detail/field-data/post-custom-detail-data.md)

## OpenAPI Specification

The raw OpenAPI 3.1 specification for this API is available at:
- [OpenAPI JSON](https://ups.ferndocs.com/openapi.json)
- [OpenAPI YAML](https://ups.ferndocs.com/openapi.yaml)