/** * Add Coupon Code to Email * * @param Mage_SalesRule_Model_Coupon $coupon * * @return $this */ protected function _filterCoupon(Mage_SalesRule_Model_Coupon $coupon) { if (!in_array('coupon', $this->_filteredObjects)) { $this->setField('couponCode', $coupon->getCode()); $this->_filteredObjects[] = 'coupon'; } return $this; }