API / REST API v3

Hi,

I'm trying to use the API with Servicedesk Plus On Demand, and I'm confused as to which version to use.

I'd like to use v3 as described here - https://www.manageengine.com/products/service-desk/sdpod-v3-api/SDPOD-V3-API.html (which does suggest it's a beta version)

and I have created an Authtoken and can do some queries, for example getting an individual request details.

However I'm struggling to use input_data to filter all requests - for example to get a specific request from its display id -

input_data={"list_info":{"search_fields":{"display_id":"1317"}}}

I just get an internal error response back.

Is this API something I should be using, or should I be looking at the API as described by https://api-sdpondemand.wiki.zoho.com/Getting-started.html

Thanks.

Jeremy