diff --git a/MangoPay.SDK/Core/APIs/ApiOAuth.cs b/MangoPay.SDK/Core/APIs/ApiOAuth.cs
index 39082fe..4751834 100644
--- a/MangoPay.SDK/Core/APIs/ApiOAuth.cs
+++ b/MangoPay.SDK/Core/APIs/ApiOAuth.cs
@@ -27,6 +27,10 @@ public async Task<OAuthTokenDTO> CreateTokenAsync(CreateOAuthTokenPostDTO entity
             restTool.AddRequestHttpHeader(Constants.AUTHORIZATION,
                 $"{Constants.BASIC} {authHelper.GetHttpHeaderBasicKey()}");
             restTool.AddRequestHttpHeader(Constants.CONTENT_TYPE, Constants.APPLICATION_X_WWW_FORM_URLENCODED);
+            if (Root.Config.UKHeaderFlag)
+            {
+                restTool.AddRequestHttpHeader(Constants.TENANT_ID, "uk");
+            }
 
             return await restTool.RequestAsync<OAuthTokenDTO, CreateOAuthTokenPostDTO>(endPoint, null, entity);
         }   
diff --git a/MangoPay.SDK/Core/Configuration.cs b/MangoPay.SDK/Core/Configuration.cs
index 7138690..35e911c 100644
--- a/MangoPay.SDK/Core/Configuration.cs
+++ b/MangoPay.SDK/Core/Configuration.cs
@@ -20,6 +20,9 @@ public class Configuration
 		/// <summary>Timeout in miliseconds to use for API calls, set to zero to use the default .NET <see cref="HttpWebRequest"/> timeout of 100 seconds</summary>
 		public int Timeout = 0;
 
+        /// <summary>Set to true for uk traffic</summary>
+        public bool UKHeaderFlag = false;
+
 		/// <summary>API version (added in dashboard's SDK only in order to handle both old and new address fields).</summary>
 		public string ApiVersion = "v2.01";
 
diff --git a/MangoPay.SDK/Core/Constants.cs b/MangoPay.SDK/Core/Constants.cs
index cc7f2ff..f68e00c 100644
--- a/MangoPay.SDK/Core/Constants.cs
+++ b/MangoPay.SDK/Core/Constants.cs
@@ -129,5 +129,8 @@ public static class Constants
 
 		/// <summary>Resolves to "WalletId" string.</summary>
 		public const string WALLET_ID = "WalletId";
+
+		/// <summary>Tenant header</summary>
+		public const string TENANT_ID = "x-tenant-id";
     }
 }
diff --git a/MangoPay.SDK/Core/RestTool.cs b/MangoPay.SDK/Core/RestTool.cs
index a1826b9..975016e 100644
--- a/MangoPay.SDK/Core/RestTool.cs
+++ b/MangoPay.SDK/Core/RestTool.cs
@@ -552,6 +552,11 @@ private async Task<Dictionary<string, string>> GetHttpHeadersAsync(string restUr
                 { Constants.USER_AGENT, $"MangoPay V2 SDK .NET {_root.GetVersion()}" }
             };
 
+            if (_root.Config.UKHeaderFlag)
+            {
+                httpHeaders.Add(Constants.TENANT_ID, "uk");
+            }
+
             // AuthenticationHelper http header
             if (!this._authRequired) return httpHeaders;