> ## Documentation Index
> Fetch the complete documentation index at: https://docs.quickblox.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Subscription Model

| Property name                           | Type          | Description                                                                                                                                                                                                                        |
| --------------------------------------- | ------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| id                                      | int           | ID of the subscription. Generated automatically by the server after subscription creation.                                                                                                                                         |
| notification\_channel                   | nested object | Declare which notification channels could be used to notify user about events.                                                                                                                                                     |
| notification\_channel.name              | string        | Notification channel name. Possible values are: `apns`, `apns_voip`, `gcm`, `email`.                                                                                                                                               |
| device                                  | nested object | Device details which subscribes to receive notifications.                                                                                                                                                                          |
| device.client\_identification\_sequence | string        | Unique hash to identify a client device in third-party service such as APNs or GCM/FCM. Initially retrieved from third-party service and should be sent to QuickBlox to let it consequently send push notifications to the client. |
| device.platform                         | nested object | A platform of a device that is a source of the application running.                                                                                                                                                                |
| device.platform.name                    | string        | Platform name. Possible values are: `ios` and `android`.                                                                                                                                                                           |
| device.bundle\_identifier               | string        | A unique identifier for client's application. In iOS, this is a Bundle Identifier. In Android, a package ID.                                                                                                                       |
| device.udid                             | string        | UDID (Unique Device Identifier) of a device, which is the source of application running. This must be any sequence identifying a particular device. This is needed to support schema: 1 User => Multiple devices.                  |