Pay Pal is not communicating with your shop. You need to use the pay pal api module or change a setting in pay pal itself. Go into your Pay Pal account and click on profile, instant payment notification preferences, edit settings, type in your notification url ( http://www.aero-files.com/shop/ipn_main_handler.php ) and then turn on Receive IPN messages (Enabled) then save. This is actually part of the api set-up but it does work this way. This is the way I use it so customers dont need a Pay Pal account to use.