Need help with PayPal URLs

[eluser]Akinzekeel[/eluser]
I tried enabling query-strings too and it kinda worked, but unfortunately the rest of the page was a horrible mish-mash of segment-query-urls :/

@Mat-Moo
I'm using the original PHP Code from PayPal, I just modified it so it's a CI library. I posted it here: http://pastebin.com/eSETwtsN