diff --git a/booking.stripe.inc b/booking.stripe.inc
index 45015ee..adb7d93 100644
--- a/booking.stripe.inc
+++ b/booking.stripe.inc
@@ -236,7 +236,9 @@ function booking_stripe_validate_form_payment($form, &$form_state) {
     drupal_set_message($e->getMessage(), 'error');
   }
   catch (\Stripe\Exception\CardException $e) {
-    watchdog('booking', $e->getMessage());
+    $e_json = $e->getJsonBody();
+    watchdog('booking', "Detected exception processing Stripe payment : !message . !error", 
+      array('!message' => $e->getMessage(), '!error' => $e_json['error']));
     drupal_set_message($e->getMessage(), 'error');    
   }
 }