Paypal button notify_url with PHP?

Chuck C

New member
If the notify_url was /a.php

a.php's code is:
<?php
if($_SERVER[REMOTE_ADDR] == "PALPAL'S IP")
{
//Payment complete
}
else
{
//Normal page visit, no payment made
}

If that code is correct, what is the IP I would use?
 
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