Request body filters on /messages/view API are not working

Request body filters on /messages/view API are not working

I am using the /messages/view API and I am trying to send a folder ID and message limit in the GET body as per this documentation GET - List of Emails in a folder (zoho.com). I am getting a list of messages back but they are not just from the folder I have specificed and every time I get 10 messages. 

Can you help me navigate this please?

Headers - Zoho-oauthtoken <ACESS TOKEN>
BODY - "folderid" : <folderid>, "limit" : 1

As mentioned I am gettting messages back so I know the URL and headers are good. It just doesn't seem to be doing anything with the filters I am sending in the GET request body.

I have been instructed to send the "limit" value as a param and that seems to work but the folderid can't be sent as a param. 

Any suggestions?