Paypal Checkout with extra info - php

Question

First of all, good job on the community for being so helpfull :D
So i have a webshop, with easy paypal checkout:
echo
"<form action='https://www.paypal.com/cgi-bin/webscr' method='post'>
<input type='hidden' name='business' value='MYMAILYEAH'>
<input type='hidden' name='cmd' value='_xclick'>
<input type='hidden' name='itemdesc' value='".$row['Description']."' />
<input type='hidden' name='item_name' value='".$row['name']."'>
<input type='hidden' name='amount' value='".$pricee."'>
<input type='hidden' name='currency_code' value='EUR'>
<input type='hidden' name='quantity' value='".$_POST['iamount']."'>
<input type='image' name='submit' border='0' src='https://www.paypal.com/en_US/i/btn/btn_buynow_LG.gif' alt='PayPal - The safer, easier way to pay online'>
<input type='hidden' name='address_override' value='1'>
<input type='hidden' name='first_name' value='".$_SESSION['username']."'>
</form>";
At the moment, when someone buys anything it shows only the price and the name of the object, is it also possible to send any extra notes/item description with it? Because i found out that alot of people didnt have their invoice adres set correctly in paypal...
A huge thanks in advance!
EDIT:
I found a part of the problem and solution:
I am getting an error at the CITY input;
<input type='hidden' name='first_name' value='".$_SESSION['username']."'>
<input type='hidden' name='last_name' value='".$_SESSION['username']."'>
<input type='hidden' name='country' value='NL'>
<input type='hidden' name='city' value='Arnhem'>
What the error says is:
There is a problem with the sendingadres. We marked this RED (the white arrow)
Change the adress and continue paying with paypal.
And under that it says:
This webshop told us to use the sendingadres input from the webshop, and theres a problem with this adres, go back to the webshop to change it.

Answer 1

First of all don't use a post variable directly in your code since the user sets it and can therefore easily manipulate the form.
It doesn't seem to work with the simple form. Here you can find all possible variables.

Answer 2

Solution was;
adding
<input type='hidden' name='address_override' value='1'>
<input type='hidden' name='first_name' value='".$_SESSION['username']."'>
<input type='hidden' name='last_name' value='".$_SESSION['username']."'>
<input type='hidden' name='country' value='NL'>
<input type='hidden' name='city' value='Arnhem'>
To override the paypal sendingadres.