# Data Fields

Endpoints for managing custom data fields associated with subscribers.
These operations are used to define, retrieve, and map structured subscriber data for personalization and integration purposes.

 - [GET /field](https://developers.klicktipp.com/management-api/data-fields/api.customfield.index.md): Lists data fields. Without `detail=true`, each key maps to its name; with `detail=true`, each key maps to an object with `name` and `type`. All entries in a response use the same format. Collection ke
 - [GET /field/{fieldid}](https://developers.klicktipp.com/management-api/data-fields/api.customfield.retrieve.md): Gets a data field by its unprefixed ID. For example, collection key `field12345` is retrieved with `/field/12345`; `fieldFirstName` with `/field/FirstName`. Without `detail=true`, the response contain