Sorry I missed your call! I am just getting back to this. Everything works through PayPal although I am still dealing with the php notices between the course registration page and the cart page. Do you have any time tomorrow morning (Friday) between 9 and 11?
I am also stuck on how to make the new text fields on the cart page maintain their values if filled in and then the continue shopping button is pressed. I'm unsure whether names etc. are captured in a session to reuse or repopulate the fields when the cart page reloads again or if this is possible.
Also, what does the code $ATC_AddIfIn = 2; mean? Some of the ATC buttons have a 2 value and some have "" ? It's probably clear, but I'm missing it.