How to reply to a comment through services in Drupal 7? I am using Drupal 7 as back-end for a mobile application. I am using comments in my application.

Can anyone help me to reply to comment through web-service?
This is how I was able to reply to a comment through web-service. 

 URL:- example.com/rest/comment
 Method : POST
 Parameters:-
 nid :6
 pid: 4
 comment_body[und][0][value]: Some text