Email invoice functionality

Author: MJMortimer

Xero.Api/Core/Endpoints/InvoicesEndpoint.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Net;
 using Newtonsoft.Json.Converters;
 using Xero.Api.Common;
 using Xero.Api.Core.Endpoints.Base;
@@ -19,6 +20,7 @@ public interface IInvoicesEndpoint : IXeroUpdateEndpoint<InvoicesEndpoint, Invoi
         IInvoicesEndpoint ContactIds(IEnumerable<Guid> contactIds);
         IInvoicesEndpoint Statuses(IEnumerable<InvoiceStatus> statuses);
         IInvoicesEndpoint InvoiceNumbers(IEnumerable<string> invoiceNumbers);
+        void EmailInvoice(Guid invoiceId);
     }
 
     public class InvoicesEndpoint
@@ -60,6 +62,15 @@ public IInvoicesEndpoint InvoiceNumbers(IEnumerable<string> invoiceNumbers)
             return this;
         }
 
+        public void EmailInvoice(Guid invoiceId)
+        {
+            var response = Client.Client.Post(string.Format("api.xro/2.0/invoices/{0}/emails", invoiceId), string.Empty);
+            if (response.StatusCode != HttpStatusCode.NoContent)
+            {
+                Client.HandleErrors(response);
+            }
+        }
+
         public override void ClearQueryString()
         {
             base.ClearQueryString();