using System;

using System.IO;

using System.Net;

using System.Text;

using System.Web;

​

public class Program

{

    public static void Main()

    {

        string response = ApiUnclaimedDraft(

            "[PUT_API_KEY_HERE]",

            true,

            "http://www.analysis.im/uploads/seminar/pdf-sample.pdf",

            "request_signature",

            "Example Signer Name",

            "example@example.com",

            new[]{

                new[]{ "Metadata1", "abc123" },

                new[]{ "Metadata2", "Policy.pdf" }

            }

        );

        Console.WriteLine(response);

    }

​

    public static string ApiUnclaimedDraft(string apiKey, bool isTest, string file, string type, string name, string email, string[][] metadata)

    {

        HttpWebRequest request = (HttpWebRequest)WebRequest.Create("https://api.hellosign.com/v3/unclaimed_draft/create");

        request.Method = "POST";

​

        var postData = "test_mode=" + (isTest ? "1" : "0");

            postData += "&file_url[0]=" + HttpUtility.UrlEncode(file); // OR -- postData += "&file[0]=" + HttpUtility.UrlEncode(file);

            postData += "&type=" + type;

            postData += "&signers[0][name]=" + HttpUtility.UrlEncode(name);

            postData += "&signers[0][email_address]=" + HttpUtility.UrlEncode(email);

        for(int i = 0; i < metadata.Length; i++)

        {

            postData += "&metadata[" + HttpUtility.UrlEncode(metadata[i][0]) + "]=" + HttpUtility.UrlEncode(metadata[i][1]);

        }

        var data = Encoding.ASCII.GetBytes(postData);

​

        request.ContentType = "application/x-www-form-urlencoded";

        request.ContentLength = data.Length;

        string authorization = apiKey + ":";

        byte[] binaryAuthorization = System.Text.Encoding.UTF8.GetBytes(authorization);

        authorization = Convert.ToBase64String(binaryAuthorization);

        authorization = "Basic " + authorization;

        request.Headers.Add("AUTHORIZATION", authorization);

        using (var stream = request.GetRequestStream())

        {

            stream.Write(data, 0, data.Length);

        }

​

        HttpWebResponse response = (HttpWebResponse)request.GetResponse();

        return new StreamReader(response.GetResponseStream()).ReadToEnd();

    }

}