---
title: Event
slug: content-marketing-platform/api/zfJd-event
docTags: 
createdAt: 2026-06-24T17:56:57.216Z
---

## event\_added

\<span style=\{\{ backgroundColor: "#e95f6a", padding: "5px", borderRadius: "5px" }}>Experimental An event was created.

### Payload

| **Key**                     | **Type** | **Description**                                                 |
| --------------------------- | -------- | --------------------------------------------------------------- |
| event\_name                 | string   | Name of the event. The value is `event_added`.                  |
| data                        | object   | Data of the event.                                              |
| data\[event]                | object   | Data of the event associated with the webhook event.            |
| data\[event]\[id]           | string   | Unique identifier of the event.                                 |
| data\[event]\[links]        | object   | Links related to the event.                                     |
| data\[event]\[links]\[self] | string   | URL to fetch the details of the event through the CMP Open API. |

### Example

```json
{
  "event_name": "event_added",
  "data": {
    "event": {
      "id": "6f910551b00a722e04188e",
      "links": {
        "self": "https://api.cmp.optimizely.com/v3/events/6f910551b00a722e04188e",
      }
    }
  }
}
```

## event\_modified

\<span style=\{\{ backgroundColor: "#e95f6a", padding: "5px", borderRadius: "5px" }}>Experimental An event was modified.

The webhook event is triggered when following attributes of an event change:

- `title`
- `description`
- `is_all_day`
- `start_date`
- `end_date`

### Payload

| **Key**                     | **Type** | **Description**                                                 |
| --------------------------- | -------- | --------------------------------------------------------------- |
| event\_name                 | string   | Name of the event. The value is `event_modified`.               |
| data                        | object   | Data of the event.                                              |
| data\[event]                | object   | Data of the event associated with the webhook event.            |
| data\[event]\[id]           | string   | Unique identifier of the event.                                 |
| data\[event]\[links]        | object   | Links related to the event.                                     |
| data\[event]\[links]\[self] | string   | URL to fetch the details of the event through the CMP Open API. |

### Example

```json
{
  "event_name": "event_modified",
  "data": {
    "event": {
      "id": "6f910551b00a722e04188e",
      "links": {
        "self": "https://api.cmp.optimizely.com/v3/events/6f910551b00a722e04188e",
      }
    }
  }
}
```