Im coding a checkout for my site, but i dont know how to change the item quantity so when the person clicks on the link to pay, it shows how many items of the product he purchased. I change the undefined_quantity=1 to any other number but it doesnt change when i get to the paypal page. https://www.paypal.com/cgi-bin/webscr?cmd=_xclick&business=zero24%40gmail%2ecom&[B]undefined_quantity=4[/B]&item_name=25%20Social%20Bookmarking%20Submissions&item_number=3&amount=7.00&no_shipping=0&return=http%3a%2f%2fwwww%2esubmitque%2ecom%2fordercomplete%2ephp&no_note=1¤cy_code=USD&lc=CA&bn=PP%2dBuyNowBF&charset=UTF%2d8 Code (markup): Edit: I changed it and treated multiple quantities as one and just put the total price in the &amount= part. (this works better too)