C# : How to post more than PDF file

Hi eSignLive Team, I am working on an integration between eSign Live and Ebix Inc. Life eApp and in this integration we require to perform in person signature ceremony , and I created a console application in .Net C# and having an issue (Bad Request 400 and Can not deserialize instance of java.util.ArrayList ) while sending multiple PDFs to eSignLive and didn't get the package Id however it worked fine for a single PDF file. Here is the require details which you need to troubleshot this issue: 1. URL : "https://sandbox.esignlive.com/api" where I am posting request for package creation. 2.