Zoho CRM - Rest API - Insert Record - How do I put the Lead into approval mode.?

Zoho CRM - Rest API - Insert Record - How do I put the Lead into approval mode.?

I am inserting a lead from a web form using Rest API. I would like to put the lead into approval list.


I see there is trigger parameter with approval value. Also there is  $approved key 
in the documentation.

https://www.zoho.com/crm/developer/docs/api/insert-records.html

What is the parameter to use to set the approval mode?