return url

-- url of the page with the problem -- : www.padelcabriolo.it

it is possible to indicate in return url the purchased items? (for example using alias url)
i have many items in my shop and i need to know in return url which items has been purchased
can i have and example?

thanks for support.
i use hikashop in order to permit to registered user to buy coin.
I need to know if the user buy items "1 coin" or items "10 coin" because after the succesfull payment i need (with my php code) to add the correct number of coin to the user profile. so i need that the return url is a custom php page (created by myself) because i need with a php code add the coin to the user.
How i can manage this situation?
thanks

i use paypal pluigin. can i pass in the return url the order id by parameter?
in the return url php page how i can extract the product ordered knowing the order id?

good morning
in the return page i use this code but i don't show the prodcuts name. what is the error?

$orderClass = hikashop_get('class.order');

$app =& JFactory::getApplication();
$order_id = $app->getUserState('com_hikashop.order_id');

$order = $orderClass->loadFullOrder($order_id, true, false);

foreach($order->products as $product) {
echo $product->product_name.'<br/>';
}

thanks

ok thanks now i can read order_id in the return page
but i still can't detect the product ordered, the following code don't work i don't see anything print on the screen

$orderClass = hikashop_get('class.order');
$order = $orderClass->loadFullOrder($order_id, true, false);
foreach($order->products as $product) {
echo $product->product_name.'<br/>';
}

thanks

ok thanks
in order to know the price of the items in order what is the variable to read?
thanks