/**
  * add the gift sender, recipient and message to payload
  * @param  IGifting
  * @param  Varien_Object
  * @return self
  */
 protected function _addEnvelopeInfo(IGifting $giftingPayload, Varien_Object $giftingItem)
 {
     $messageId = $giftingItem->getGiftMessageId();
     if ($messageId) {
         $message = Mage::getModel('giftmessage/message')->load($messageId);
         if ($giftingItem->getGwAddCard()) {
             $this->_addAsGiftCard($giftingPayload, $message);
         } else {
             $this->_addAsPackSlip($giftingPayload, $message);
         }
     }
     return $this;
 }