diff --git a/app/Classes/Modules/Billplzs/ControllersLogic/CallbackBillplzLogic.php b/app/Classes/Modules/Billplzs/ControllersLogic/CallbackBillplzLogic.php
index 42726384..38f047cd 100644
--- a/app/Classes/Modules/Billplzs/ControllersLogic/CallbackBillplzLogic.php
+++ b/app/Classes/Modules/Billplzs/ControllersLogic/CallbackBillplzLogic.php
@@ -86,6 +86,12 @@ class CallbackBillplzLogic
         $billplzXSignatureObject = new BillplzXSignatureObject($request);
 
         if(!$billplzXSignatureObject->isValidSignature()){
+            Log::info('Billplz signature validation failed', [
+                'computed_signature' => $billplzXSignatureObject->getBillPlzComputedXSignature(),
+                'request_signature' => $request->input('x_signature'),
+                'constructed_string' => $billplzXSignatureObject->getBillPlzConstructString(),
+                'request_data' => $request->all(),
+            ]); //cief todo: 137 - DEBUG
             throw new MalformedRequestException('Billplz Payment validation failed.');
         }