diff --git a/config/config.php b/config/config.php
index 55cf93b..559e91e 100644
--- a/config/config.php
+++ b/config/config.php
@@ -45,6 +45,11 @@
         'source_chargeable' => env('PAYMONGO_WEBHOOK_SIG_SOURCE_CHARGABLE', env('PAYMONGO_WEBHOOK_SIG')),
     ],
 
+    /**
+     * Webhook signature configuration for backwards compatibility.
+     */
+    'webhook_signature' => env('PAYMONGO_WEBHOOK_SIG'),
+
     /*
      * This is the name of the header where the signature will be added.
      */