Retrieving PDF report from BO4.1 Webservice

I am trying to migrate my web service client from BO 3.x to BO 4.1 Restful.

The existing implementation of BO 3.x use below inputs and using BO java SDK it retrieves CUID and doc properties to get the PDF report.

1. Report Path : path://InfoObjects/Root Folder/Application Name/Report Name.rpt
2. Fill Parameter List
   1. Parameter 1, Parameter 2, Parameter 3 etc to identify a report.

I have constructed my client code to get Logon token from RESTful web service. However I am not sure how to retrieve the PDF file now in BO 4.1.

Many of the samples I have seen uses sIDType and iDocID parameters along with Token value to retrieve the documents.

Is it must to have iDocID to retrieve document or do we have any other way to retrieve the PDF document with the Report Path and parameter values ?

Please assist me on it. Thanks