Get status if push notifications are turned on/off for offline messages in a dialog.
Get Notification Settings with API key
1. Use 'Authorization' header to pass API key
2. Use 'On-Behalf-Of' header to pass user_id
3. Set dialog ID
4. As result, the API returns the notification settings status
ApiKey {your_api_key}
. Must be used either QB-Token or Authorization.200
400