[RESOLVED] paypal integration - How to upload order no

[toxic_brain]

I am using PyPal , and upload cart while the user check-out.

i am able to upload the cart items, and all other information succesfully.

<form action="https://www.sandbox.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="[e-mail]"> 
 <input type="hidden" name="item_name_1" value="Terminator III DVD"> 
 <input type="hidden" name="amount_1" value="1.00"> 
-------

but

not able to upload order number generated from the site to paypal. is there anyway?

[toxic_brain]

oh, i got it

 <input type="hidden" name="invoice" value="Order No. 500">