# The event callback object

An event callback object is returned as part of the response body of each successful list or retrieve API call to the `/api/event_callbacks` endpoint.

## Fields

| Field                            | Type       | Description                                                                                                                                                                                         |
| -------------------------------- | ---------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **type**                         | `string`   | `event_callbacks`                                                                                                                                                                                   |
| **id**                           | `string`   | The event callback unique identifier                                                                                                                                                                |
| links.**self**                   | `string`   | The event callback endpoint URL                                                                                                                                                                     |
| attributes.**callback\_url**     | `string`   | The URI of the callback, inherited by the associated webhook.                                                                                                                                       |
| attributes.**payload**           | `object`   | The payload sent to the callback endpoint, including the event affected resource and the specified includes.                                                                                        |
| attributes.**response\_code**    | `string`   | The HTTP response code of the callback endpoint.                                                                                                                                                    |
| attributes.**response\_message** | `string`   | The HTTP response message of the callback endpoint.                                                                                                                                                 |
| 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.                                        |
| relationships.**webhook**        | `object`   | The associated webhook.                                                                                                                                                                             |
| relationships.**event\_stores**  | `array`    | The associated event stores.                                                                                                                                                                        |
| meta.**mode**                    | `string`   | The resource environment (can be one of `test` or `live`)                                                                                                                                           |