Dinamični remarketing na FB: Kako implementirati pixel v Magento

<?php
class Optiweb_Fbpixel_Helper_Exportcsv extends Mage_Core_Helper_Abstract
{
    protected $_list = null;
	protected $_currency_code = null;
 
    public function __construct()
    {
        $collection = Mage::getModel('catalog/product')->getCollection()
            ->addAttributeToSelect(array('name', 'description', 'thumbnail', 'url_path', 'price'))
			->addFieldToFilter('visibility', Mage_Catalog_Model_Product_Visibility::VISIBILITY_BOTH);          
		Mage::getSingleton('cataloginventory/stock')->addInStockFilterToCollection($collection);		
        $this->setList($collection);
    }
 
    public function setList($collection)
    {
        $this->_list = $collection;
    }
	
	public function setCurrencyCode()
    {
        $this->_currency_code = Mage::app()->getStore()->getCurrentCurrencyCode();
    }

	protected function _parseProduct($product)
	{
		$ow_product = array(
			'id' => $product->getId(),
			'availability' => 'in stock',
			'condition' => 'new',
			'description' => $product->getDescription(),
			'image_link' => $product->getThumbnailUrl(),
			'link' => Mage::getBaseUrl(Mage_Core_Model_Store::URL_TYPE_WEB).$product->getUrlPath(),
			'title' => $product->getName(),
			'price' => $product->getPrice() . " " . $this->_currency_code,
			'brand' => $product->getManufacturer()			
		);
		return $ow_product;
	}    

    protected function _getCsvHeaders($products)
    {
		$product = $this->_parseProduct(current($products));
        $headers = array_keys($product);
        return $headers;
    }

    public function generateExportList()
    {
        if (!is_null($this->_list)) {
            $items = $this->_list->getItems();
            if (count($items) > 0) {
                $io = new Varien_Io_File();
                $path = Mage::getBaseDir('var') . DS . 'export' . DS;
                $name = md5(microtime());
                $file = $path . DS . $name . '.csv';
                $io->setAllowCreateFolders(true);
                $io->open(array('path' => $path));
                $io->streamOpen($file, 'w+');
                $io->streamLock(true);
				
                $io->streamWriteCsv($this->_getCsvHeaders($items));
                foreach ($items as $product) {					
                    $io->streamWriteCsv($this->_parseProduct($product));
                }
				$io->streamClose();
                return array(
                    'type'  => 'filename',
                    'value' => $file,
                    'rm'    => true
                );
            }
        }
    }
}