hmm, I've never tried to work this shopping cart before, I may just tinker with it a bit so I have an idea of what it requires.
With Kagi what I did was actually simple in concept. There is no way to bypass that final step of saying "Yes the info is correct and here is my credit card info" but I was able to drop their order page and replace it with what we use on ours by simply duplicating the form fields.
A lot will depend on the specific needs to be able to do this... I took the easy way out by setting up only two products with kagi -- Dollars and Cents -- regardless of what system I may use on our site to accept the orders the bottom line comes to dollars and cents and that was the only thing we utilized Kagi for..ergo the order form is separate from the payment form.
If you can utilize Kagi the same way we have and this shopping cart is customizable enough to handle it.. then it may be possible to set it up so the order is sent in one part and the payment in the next but making it look and feel seemless to the visitor to encourage them to do it all at once.
What would you like to buy? -- the shopping cart
Secretly allow the shopping cart to send the order but carry the correct info to another form (php is good for this) to have them ok the payment via kagi.... all the while not telling the shopper that they are done until after they have paid.
A lot just depends on what you're selling. For us getting the information down to the bottom line is what has kept the coding simple.
If it's possible then it may work to have the user place the order and simply say "Hey thanks, your order has been placed, it can not be processed until you pay for it though...click here for the final step and make your payment" type of thing.
[This message has been edited by Deb (edited 04-04-99).]