# The version object

A version object is returned as part of the response body of each successful list or retrieve API call to the `/api/versions` endpoint.

## Fields

| Field                             | Type       | Description                                                                                                                                                                                         |
| --------------------------------- | ---------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **`type`**                        | `string`   | `versions`                                                                                                                                                                                          |
| **`id`**                          | `string`   | The version unique identifier.                                                                                                                                                                      |
| links.**`self`**                  | `string`   | The version endpoint URL.                                                                                                                                                                           |
| attributes.**`resource_type`**    | `string`   | The type of the versioned resource.                                                                                                                                                                 |
| attributes.**`resource_id`**      | `string`   | The versioned resource ID.                                                                                                                                                                          |
| attributes.**`event`**            | `string`   | The event which generates the version.                                                                                                                                                              |
| attributes.**`ip_address`**       | `string`   | The request remote IP.                                                                                                                                                                              |
| attributes.**`user_agent`**       | `string`   | The request User Agent.                                                                                                                                                                             |
| attributes.**`uuid`**             | `string`   | The request ID.                                                                                                                                                                                     |
| attributes.**`changes`**          | `object`   | The object changes payload.                                                                                                                                                                         |
| attributes.**`who`**              | `object`   | Information about who triggered the change, only showed when it's from a JWT token.                                                                                                                 |
| attributes.**`created_at`**       | `datetime` | Time at which the resource was created.                                                                                                                                                             |
| attributes.**`updated_at`**       | `datetime` | Time at which the resource was last updated.                                                                                                                                                        |
| attributes.**`reference`**        | `string`   | A string that you can use to add any external identifier to the resource. This can be useful for integrating the resource to an external system, like an ERP, a marketing tool, a CRM, or whatever. |
| attributes.**`reference_origin`** | `string`   | Any identifier of the third party system that defines the reference code.                                                                                                                           |
| attributes.**`metadata`**         | `object`   | Set of key-value pairs that you can attach to the resource. This can be useful for storing additional information about the resource in a structured format.                                        |