How can get transaction details from paypal after

My sent data to paypal is

"https://www.paypal.com/cgi-bin/webscr/cmd=_cart&upload=1&business=seller.email@something.com&currency_code=USD&bn=BusinessName&return=http://www.sellersite.com&item_number_1=55&item_name_1=battery&amount_1=55&quantity_1=2&item_number_2=52&item_name_2=bat&amount_2=5&quantity_2=3"

And I want to show those sent data(item number, item name,amount,quantity) and the paypal transaction id to the buyer on "http://www.sellersite.com" after successful payment. (Suppose, the seller has the merchant account with paypal and he would enter that paypal id into database from admin section of the website. So,I would not think about his paypal account settings, my job is just to create the environment for paypal payment for the seller.)

If I write a script like

$T_ID=$_REQUEST['tx']; // or $T_ID=$_GET['tx']; **ref(tx):- "https://cms.paypal.com/us/cgi-bin/?cmd=_render-content&content_ID=developer/howto_html_paymentdatatransfer"

$item=$_REQUEST['item_number_1']; // or $item=$_GET['item_number_1'];

Then would I get those data from paypal ?

Please tell me.

-Thanks.

It's not going to be quite that simple. You'll need to setup Payment Data Transfer (PDT) in order to get details sent back to your return URL after the buyer completes the payment.

This is useful if you're simply going to display details back to the user, but it's not recommended for updating your own database, sending out email notifications, etc. because there is no guarantee this page will ever be reached so the code won't always run.

For that sort of thing you'll want to use Instant Payment Notification (IPN). This works very similar to PDT except that it will always POST data to your IPN listener on your server regardless of whether or not the user makes it back to your return URL, and it happens outside of your checkout system all together.