Dalla pagina https://cms.paypal.com/it/cgi-bin/?c...ml_cart_upload
codice:
<form action="https://www.paypal.com/cgi-bin/webscr" method="post"> 
<input type="hidden" name="cmd" value="_cart"> 
<input type="hidden" name="upload" value="1"> 
<input type="hidden" name="business" value="seller@designerfotos.com"> 
<input type="hidden" name="item_name_1" value="Item Name 1"> 
<input type="hidden" name="amount_1" value="1.00"> 
<input type="hidden" name="item_name_2" value="Item Name 2"> 
<input type="hidden" name="amount_2" value="2.00"> 
<input type="submit" value="PayPal"> 
</form>
tu metti (credo) per la quantità questo
<input type="hidden" name="item_number_2" value="<%=quantita%>">
mentre è questo
<INPUT TYPE="hidden" name="quantity_2" value="<%=codice%>">