Thanks for the quick reply Steve!

So the Zen Cart will run smoothly even if PayPal is the only payment option available? At the moment I don't mind having customers leave my site to pay on PayPal then return once the payment is completed.

I guess my question is: can I integrate ZC and PP in a way that is easy for customers to pick how they want to pay (even though all payment options will be handled by PayPal)?

Thanks once again!