Posts an envelope with a number tab

PostEnvelopeWIthNumberTab.cs

using DocuSign.eSign.Api;
using DocuSign.eSign.Client;
using DocuSign.eSign.Model;
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.IO;
using System.Text;

namespace PlayGround
{
    public class DocusignApiPlayground
    {
        public string Init()
        {
            string username = "";
            string password = "";
            string integratorKey = "";

            // initialize client for desired environment (for production change to www)
            ApiClient apiClient = new ApiClient("https://demo.docusign.net/restapi");
            Configuration.Default.ApiClient = apiClient;

            // configure 'X-DocuSign-Authentication' header
            string authHeader = "{\"Username\":\"" + username + "\", \"Password\":\"" + password + "\", \"IntegratorKey\":\"" + integratorKey + "\"}";
            Configuration.Default.AddDefaultHeader("X-DocuSign-Authentication", authHeader);

            // we will retrieve this from the login API call
            string accountId = null;

            /////////////////////////////////////////////////////////////////
            // STEP 1: LOGIN API        
            /////////////////////////////////////////////////////////////////

            // login call is available in the authentication api 
            AuthenticationApi authApi = new AuthenticationApi();
            LoginInformation loginInfo = authApi.Login();

            // parse the first account ID that is returned (user might belong to multiple accounts)
            accountId = loginInfo.LoginAccounts[0].AccountId;

            // Update ApiClient with the new base url from login call
            apiClient = new ApiClient(loginInfo.LoginAccounts[0].BaseUrl);

            return accountId;
        }
        public void CreateEnvelopeWithNumberTab()
        {
            string accountId = Init();

            //===========================================================
            // Step 2: Create A Draft Envelope
            //===========================================================

            // Read a file from disk to use as a document.
            byte[] fileBytes = File.ReadAllBytes(@"");

            EnvelopeDefinition envDef = new EnvelopeDefinition();
            envDef.EmailSubject = "[DocuSign C# SDK] - Envelope with Number tab";

            // Add a document to the envelope
            Document doc = new Document();
            doc.DocumentBase64 = System.Convert.ToBase64String(fileBytes);
            doc.Name = "TestFile.pdf";
            doc.DocumentId = "1";

            envDef.Documents = new List<Document>();
            envDef.Documents.Add(doc);

            // Add a recipient to sign the documeent
            Signer signer = new Signer();
            signer.Email = "Janedoe@acme.com";
            signer.Name = "Jane Doe";
            signer.RecipientId = "1";

            // Create a |Number| tab somewhere on the document for the recipient to enter a value
            signer.Tabs = new Tabs()
            {
                NumberTabs = new List<Number>()
                
            };

            var numberTab = new Number()
            {
                DocumentId = "1",
                PageNumber = "1",
                RecipientId = "1",
                XPosition = "100",
                YPosition = "100",
                Width = 80

            };

            signer.Tabs.NumberTabs.Add(numberTab);
            


            envDef.Recipients = new Recipients();
            envDef.Recipients.Signers = new List<Signer>();
            envDef.Recipients.Signers.Add(signer);

            envDef.Status = "sent";

            // |EnvelopesApi| contains methods related to creating and sending Envelopes (aka signature requests)
            EnvelopesApi envelopesApi = new EnvelopesApi();
            EnvelopeSummary envelopeSummary = envelopesApi.CreateEnvelope(accountId, envDef);
            Console.WriteLine(envelopeSummary);
        }
    }
}