NotificationAggregationRead(NotificationAggregationRead)

{
    "id": "497f6eca-6276-4993-bfeb-53cbbbba6f08",
    "group_key": "string",
    "user_id": "a169451c-8525-4352-b8ca-070dd449a1a5",
    "notification_type": "announcement",
    "title": "string",
    "summary": "string",
    "count": 0,
    "is_sent": true,
    "sent_at": "2019-08-24T14:15:22.123Z",
    "expires_at": "2019-08-24T14:15:22.123Z",
    "notification_ids": [
        "497f6eca-6276-4993-bfeb-53cbbbba6f08"
    ],
    "aggregated_data": {
        "property1": "string",
        "property2": "string"
    }
}