Now, I am able to use site24x7 API to get web page speed browser json file. 

But this is not what I need by far. I need to get the further log report of the web page speed browser. 

To retrieve monitor, I reference this site. 
 www.site24x7.com/help/api/#retrieve-monitor

But I did not see how to retrieve the log report csv file through site24x7 api further here. 
www.site24x7.com/help/api/#web-page-speed-browser