Ecommerce Tracking Analytics Magento

success.phtml

...

<?php
	// Transaction Data
	$orderID = $this->getOrderId();
	$order = Mage::getModel('sales/order')->loadByIncrementId($orderID);
	$orderTotal = $order->getGrandTotal();
	$orderDetails = $order->getData();
	$couponCode = $orderDetails['coupon_code'];
?>

<!-- script per ecommerce analitycs -->
<script type="text/javascript">
dataLayer.push({
	"ecommerce": {
		"currencyCode": "EUR",
		"purchase": {
  			"actionField": {
			    "id": "<?php echo $orderID; ?>",
			    "affiliation": "SITENAME",
			    "revenue": "<?php echo $order->getGrandTotal(); ?>",
			    "tax":"<?php echo $order->getTaxAmount(); ?>",
			    "shipping": "<?php echo $order->getShippingAmount(); ?>",
			    "coupon": "<?php echo $couponCode; ?>"
    		},
  			"products": [
				<?php	$numitem = 0; $numitem = count($order->getAllItems());
				foreach ($order->getAllVisibleItems() as $item){
				  	$numitem = $numitem - 1; ?>
				 	{
					"name": "<?php echo str_replace('"', "", $item->getName()); ?>",
				    "id": "<?php echo $item->getSku(); ?>",
				    "price": "<?php echo $item->getPrice(); ?>",
				    "quantity": <?php echo $item->getQtyOrdered(); ?>
				    }
				    <?php if ($numitem != 0) {echo ",";}
				} ?>
			]
		}
	}
});
</script>

...