Using JSON API when

Hi! Please help me.
I do not get API Response when the parameter post_status=private. When i changed this parameter to post_status=publish – all good.
I also have another parameters. How i can get API Response
Example
http://www.zimidelivery.com/wptickets/api/get_posts/?post_type=postman_sent_mail
Thanks

https://wordpress.org/plugins/json-api/