getReferenceIds example

// if we are in recalculation,             // we must not re-add any promotions. just leave it as it is.             if ($behavior->hasPermission(self::SKIP_PROMOTION)) {
                return;
            }

            // now get the codes from our configuration             // and also from our line items (that already exist)             // and merge them both into a flat list             $extensionCodes = $cartExtension->getCodes();
            $cartCodes = $original->getLineItems()->filterType(PromotionProcessor::LINE_ITEM_TYPE)->getReferenceIds();
            $allCodes = array_unique(array_merge(array_values($cartCodes), $extensionCodes));

            $allPromotions = $this->searchPromotionsByCodes($data, $allCodes, $context);

            if (!$behavior->hasPermission(self::SKIP_AUTOMATIC_PROMOTIONS)) {
                // add auto promotions                 $allPromotions->addAutomaticPromotions($this->searchPromotionsAuto($data, $context));
            }

            // check if max allowed redemption of promotion have been reached or not             // if max redemption has been reached promotion will not be added