UserNotificationPreferenceUpdate(UserNotificationPreferenceUpdate)

{
    "is_enabled": true,
    "preferred_channels": [
        "IN_APP"
    ],
    "channel_settings": {
        "property1": "string",
        "property2": "string"
    },
    "quiet_hours_start": "string",
    "quiet_hours_end": "string",
    "timezone": "string",
    "max_daily_count": 0,
    "aggregation_window": 0
}