diff --git a/LiveChatApi/LiveChatApi/Field.cs b/LiveChatApi/LiveChatApi/Field.cs
new file mode 100644
index 0000000..e2843e0
--- /dev/null
+++ b/LiveChatApi/LiveChatApi/Field.cs
@@ -0,0 +1,17 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace LiveChatApi
+{
+    public class Field
+    {
+        public string Name { get; set; }
+
+        public string Value { get; set; }
+
+        public string Url { get; set; }
+    }
+}
diff --git a/LiveChatApi/LiveChatApi/LiveChatApi.csproj b/LiveChatApi/LiveChatApi/LiveChatApi.csproj
index 2bee7a6..3f8735a 100644
--- a/LiveChatApi/LiveChatApi/LiveChatApi.csproj
+++ b/LiveChatApi/LiveChatApi/LiveChatApi.csproj
@@ -52,6 +52,7 @@
     <Compile Include="Archives.cs" />
     <Compile Include="Chat.cs" />
     <Compile Include="Constants.cs" />
+    <Compile Include="Field.cs" />
     <Compile Include="Goals.cs" />
     <Compile Include="Greetings.cs" />
     <Compile Include="Groups.cs" />
diff --git a/LiveChatApi/LiveChatApi/Visitors.cs b/LiveChatApi/LiveChatApi/Visitors.cs
index 63b3828..e21a3f9 100644
--- a/LiveChatApi/LiveChatApi/Visitors.cs
+++ b/LiveChatApi/LiveChatApi/Visitors.cs
@@ -39,16 +39,24 @@ public async Task<string> List(Dictionary<string, string> parameters = null)
             return await Api.Get(uri);
         }
 
-        public async Task<string> AddCustomDetails(string visitorID, string licenseID, string token, string id, Dictionary<string, string> fields, string icon = "")
+        public async Task<string> AddCustomDetails(string visitorID, string licenseID, string token, string id, IEnumerable<Field> fields, string icon = "")
         {
             string uri = string.Format("visitors/{0}/details", HttpUtility.UrlEncode(visitorID));
             string content = string.Format("license_id={0}&token={1}&id={2}", HttpUtility.UrlEncode(licenseID), HttpUtility.UrlEncode(token), HttpUtility.UrlEncode(id));
-            if (fields != null && fields.Count > 0)
+            if (fields != null && fields.Count() > 0)
             {
                 int i = 0;
-                foreach (var keyValuePair in fields)
+                foreach (var field in fields)
                 {
-                    content += string.Format("&fields[{0}][name]={1}&fields[{0}][value]={2}", i, HttpUtility.UrlEncode(keyValuePair.Key), HttpUtility.UrlEncode(keyValuePair.Value));
+                    string encodedName = HttpUtility.UrlEncode(field.Name);
+                    string encodedValue = HttpUtility.UrlEncode(field.Value);
+                    string encodedUrl = HttpUtility.UrlEncode(field.Url);
+
+                    if (String.IsNullOrWhiteSpace(field.Url))
+                        content += string.Format("&fields[{0}][name]={1}&fields[{0}][value]={2}", i, encodedName, encodedValue);
+                    else
+                        content += string.Format("&fields[{0}][name]={1}&fields[{0}][value]={2}&fields[{0}][url]={3}", i, encodedName, encodedValue, encodedUrl);
+
                     i++;
                 }
             }
diff --git a/LiveChatApi/LiveChatApiExample/ApiExample.cs b/LiveChatApi/LiveChatApiExample/ApiExample.cs
index 3381204..064d761 100644
--- a/LiveChatApi/LiveChatApiExample/ApiExample.cs
+++ b/LiveChatApi/LiveChatApiExample/ApiExample.cs
@@ -1,4 +1,5 @@
-using System;
+using LiveChatApi;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
@@ -599,8 +600,8 @@ public async Task VisitorsTest()
             string licenseID = "123456";
             string token = "bad02a95a61a44bd466b9cdd262ac6a0";
             string id = "my-app";
-            Dictionary<string, string> fields = new Dictionary<string, string>();
-            fields.Add("name1", "value1");
+            List<Field> fields = new List<Field>();
+            fields.Add( new Field { Name = "name1", Value = "value1" });
             result = await Api.Visitors.AddCustomDetails(visitorID, licenseID, token, id, fields);
             Console.WriteLine(result);