I have a client that wants an ad based 'landing page' with a form on it that specifies quantity, takes shipping info, CC info, and checks the user out..

I have a zen cart install up and running, but I can't find a way to do this. I came across the 'One Page Checkout' mod, but the 'use at your own risk' moderator warning scares me a bit, and it seems like it may only shorten the process, not add an item to the cart first.

Anyone know of a way I can do this with Zen?

Failing that, can anyone point me to a similar secure opensource solution that would do what I want, and operate with paypal payflow pro?

Thanks!