Hi I'm setting up a paypal ipn. i far as i know, paypal will send me the users details ( name, address etc) but i need another thing to know. I need to know the username of the one who has paid. ( username with which he/she has registered on my site) I display a form field named Username, what happens when the form is submitted to paypal? will paypal post me back the username? if so what will be the index name ($_POST[??])? thanks