diff --git a/MifielAPI/MifielAPI/ApiClient.cs b/MifielAPI/MifielAPI/ApiClient.cs
index 3eb3463..4b1c8a8 100644
--- a/MifielAPI/MifielAPI/ApiClient.cs
+++ b/MifielAPI/MifielAPI/ApiClient.cs
@@ -10,6 +10,7 @@ public class ApiClient
     {
         public string AppId { get; set; }
         public string AppSecret { get; set; }
+        public string CompanyId { get; set; }
         private string _apiVersion = "/api/v1/";
         private CultureInfo _usCulture = new CultureInfo("en-US");
         private string url;
@@ -34,6 +35,14 @@ public ApiClient(string appId, string appSecret)
             Url = "https://www.mifiel.com";
         }
 
+        public ApiClient(string appId, string appSecret, string companyId)
+        {
+            AppId = appId;
+            AppSecret = appSecret;
+            Url = "https://www.mifiel.com";
+            CompanyId = companyId;
+        }
+
         public HttpContent Get(string path)
         {
             return SendRequest(Rest.HttpMethod.GET, path, new StringContent(""));
@@ -114,6 +123,11 @@ private void SetAuthentication(Rest.HttpMethod httpMethod, string path, HttpRequ
 
             requestMessage.Headers.Add("Authorization", authorizationHeader);
             requestMessage.Headers.Add("Date", date);
+
+            if (!String.IsNullOrEmpty(CompanyId))
+            {
+                requestMessage.Headers.Add("MF-COMPANY", CompanyId);
+            }
         }
 
         private string GetSignature(Rest.HttpMethod httpMethod, string path, string contentMd5, string date, string contentType)