Update another __toJSON()

booking.stripe.inc

@@ -301,7 +301,7 @@ function _booking_process_stripe_payment(&$charge, $token) {
       'booking_buyer_email' => $charge->receipt_email,
       'booking_item_name' => $charge->description,
       'booking_ipn_track_id' => $charge->id,
-      'booking_stripe_response' => $charge->__toJSON(),
+      'booking_stripe_response' => $charge->toJSON(),
     ))
     ->execute();