diff --git a/src/GatewayChecksum.php b/src/GatewayChecksum.php
index b0b46a0..f3719ec 100644
--- a/src/GatewayChecksum.php
+++ b/src/GatewayChecksum.php
@@ -11,8 +11,8 @@
 class GatewayChecksum
 {
     public static $checksum = "";
-    public static $baseChecksum = "9c96ff767ca901ad4f922c8ae2d0c405";
-    public static $versionNo = "P7.10";
+    public static $baseChecksum = "91f13a9d7bae09074b5f8f6742b3c763";
+    public static $versionNo = "P7.11";
 
 //////////////////////////////////////////////////////////////////////
 //
@@ -30,7 +30,7 @@ static function SetVersion()
             md5_file($dirName . "/GatewayCodes.php");
         GatewayChecksum::$checksum = md5($baseString);
         if (GatewayChecksum::$checksum != GatewayChecksum::$baseChecksum) {
-            GatewayChecksum::$versionNo = "P7.10m";
+            GatewayChecksum::$versionNo = "P7.11m";
         }
     }
 }
diff --git a/src/GatewayResponse.php b/src/GatewayResponse.php
index 1577812..5117fdc 100644
--- a/src/GatewayResponse.php
+++ b/src/GatewayResponse.php
@@ -455,4 +455,9 @@ static function SETTLED_CURRENCY()
     {
         return "approvedCurrency";
     }
+    
+    static function RETRIEVAL_ID()
+    {
+       return "retrievalNo";
+    }
 }