# Notifications

## Change notification

This operation is used by Mews to notify the channel manager when there is a change in the connection configuration. It is optional for the channel manager to implement this endpoint, it is used in case of a fully-automated connection.

The following changes trigger notification:

* Connection is disabled
* Connection is enabled
* Connection is deleted
* A new connection is created
* A new space is added to a mapped space category
* A space category is unmapped or unsynchronized
* A new rate is mapped
* A rate is unmapped or unsyncronized
* A new rate-space category combination is created

### Request

`[ChannelManagerApiAddress]/changeNotificaton`

```javascript
{
    "clientToken": "[Mews Client token]",
    "connectionToken": "[Token of a concrete connection]",
    "type": 0
}
```

| Property          | Type     | Contract | Description                                              |
| ----------------- | -------- | -------- | -------------------------------------------------------- |
| `clientToken`     | `string` | required | Client token of the channel manager.                     |
| `connectionToken` | `string` | required | Connection token of a property connection.               |
| `type`            | `int`    | required | [`Change Notification Type`](#change-notification-type). |

#### Change Notification Type

| Code | Description                                                 |
| ---- | ----------------------------------------------------------- |
| `0`  | Created                                                     |
| `1`  | Updated                                                     |
| `2`  | Activated                                                   |
| `3`  | Deactivated (in Mews, the whole connection can be disabled) |
| `4`  | Deleted                                                     |

### Response

[Synchronous simple response](/channel-manager-api/guidelines/responses.md#synchronous-simple-response) is expected to determine whether the update was accepted or not.


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