diff --git a/src/GatewayChecksum.php b/src/GatewayChecksum.php
index 8e95fe1..ed31fe7 100644
--- a/src/GatewayChecksum.php
+++ b/src/GatewayChecksum.php
@@ -10,9 +10,9 @@
 
 class GatewayChecksum
 {
-    private const VERSION = "P8.16";
+    private const VERSION = "P8.17";
     public static $checksum = "";
-    public static $baseChecksum = "f23b94cc9ee73502ed35284d963c5bec";
+    public static $baseChecksum = "9f431e8ab78f49b3ac956b3386ce02d2";
     public static $versionNo = GatewayChecksum::VERSION;
 
 //////////////////////////////////////////////////////////////////////
diff --git a/src/GatewayCodes.php b/src/GatewayCodes.php
index 8ad0582..5dc7e4f 100644
--- a/src/GatewayCodes.php
+++ b/src/GatewayCodes.php
@@ -214,4 +214,5 @@ class GatewayCodes {
     const REASON_INVALID_REFERENCE_SCHEME_TRANSACTION = 459;
     const REASON_INVALID_CUSTOMER_ADDRESS    = 460;
     const REASON_INVALID_BUILD_PAYMENT_LINK_REQUEST = 462;
+    const REASON_INVALID_GOOGLE_PAY_TOKEN = 464;
 }