/* This macro will be parsed as PHP code (see http://www.php.net)

The calculateshipping function is called every time a shipping calculation request is made by Shopify.

The function must return an array of available shipping options, otherwise no shipping options will be returned to your customers.
*/
function calculateshipping($DATA) {

    /* do not edit above this line */

    $_RATES = array();

    $DATA = enrichProductDetails($DATA);

	$containsTag = false; //looks for a tag named MY_TAG (case sensitive)
	foreach ($DATA['items'] as $item) {
		if (isset($item['tags']) && in_array('MY_TAG',$item['tags'])) {
			$containsTag = true;
		}
	}

    return $_RATES;

    /* do not edit below this line */

}