src/PrestaShop/Invoice/Creator.php
protected function getDiscountLinesOrder()
    {
        $result = array();

        foreach ($this->order->getCartRules() as $line) {
            $result[] = $this->getDiscountLineOrder($line);
        }

        return $result;
    }
protected function getDiscountLinesOrder()
    {
        $result = array();

        foreach ($this->order->getCartRules() as $line) {
            $result[] = $this->getDiscountLineOrder($line);
        }

        return $result;
    }
protected function getDiscountLinesOrder ( ) { $ result = array ( ) ; foreach ( $ this -> order -> getCartRules ( ) as $ line ) { $ result [ ] = $ this -> getDiscountLineOrder ( $ line ) ; } return $ result ; }
In a Prestashop order the discount lines are specified in Order cart
rules.

@return array[]
In a Prestashop order the discount lines are specified in Order cart rules .