Added submitConversion method and tests

Nexmo.Api.Test.Integration/AccountTest.cs

@@ -21,6 +21,13 @@ public void should_get_pricing()
             Assert.AreEqual("Verizon Wireless", verizon.network);
         }
 
+        [TestMethod]
+        public void should_get_prefix_pricing()
+        {
+            var pricing = Account.GetPrefixPricing("1","sms");
+            Assert.AreEqual("US", pricing.country);
+        }
+
         [TestMethod]
         public void should_set_settings()
         {

Nexmo.Api.Test.Integration/ConversionTest.cs

@@ -0,0 +1,26 @@
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Nexmo.Api.Test.Unit
+{
+    [TestClass]
+    public class ConversionTest 
+    {
+        public void Should_submit()
+        {
+            Conversion.ConversionType = "sms";
+            Conversion.SubmitConversion(new Conversion.ConversionRequest
+            {
+                MessageId = "",
+                Delivered = true,
+                Timestamp = DateTime.UtcNow
+            });
+
+
+        }
+    }
+}

Nexmo.Api/Client/Conversion.cs

@@ -0,0 +1,23 @@
+using Nexmo.Api.Request;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Nexmo.Api.Client
+{
+    public class Conversion
+    {
+        public Credentials Credentials { get; set; }
+        public Conversion(Credentials creds)
+        {
+            Credentials = creds;
+        }
+
+        public void SubmitConversion (Api.Conversion.ConversionRequest request, Credentials creds = null)
+        {
+            Api.Conversion.SubmitConversion(request, creds);
+        }
+    }
+}

Nexmo.Api/Conversion.cs

@@ -0,0 +1,51 @@
+using Newtonsoft.Json;
+using Nexmo.Api.Request;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Nexmo.Api
+{
+    public static class Conversion
+    {
+        /// <summary>
+        /// possible values : "voice" or "sms"
+        /// </summary>
+        public static string ConversionType { get; set; }
+
+        public class ConversionRequest
+        {
+            /// <summary>
+            /// The ID you receive in the response to a request.
+            /// possible values: message-id for SMS API, call-id for TTS and TTSP APIs, 
+            /// event_id for Verify API.
+            /// </summary>
+            [JsonProperty("message-id")]
+            public string MessageId { get; set; }
+            /// <summary>
+            /// Set to true if your user replied to the message you sent. 
+            /// Otherwise, set to false. 
+            /// </summary>
+            [JsonProperty("delivered")]
+            public bool Delivered { get; set; }
+            /// <summary>
+            /// When the user completed your call-to-action in UTC±00:00 
+            /// format: yyyy-MM-dd HH:mm:ss.
+            /// </summary>
+            [JsonProperty("timestamp")]
+            public DateTime Timestamp { get; set; }
+        }
+
+        /// <summary>
+        /// Tells if a message or call was successful.
+        /// </summary>
+        /// <param name="request"></param>
+        /// <param name="creds"></param>
+        public static void SubmitConversion (ConversionRequest request, Credentials creds = null)
+        {
+            var response = ApiRequest.DoPostRequest(new Uri($"https://api.nexmo.com/conversions/{ConversionType}"), request, creds);
+        }
+    }
+}