Re: AJAX 1 page checkout - which cart?
paypal or googlecart look naff, and I would trust paypal with my money.
I would most liekly use secure trading to actually take the details, so the 'checkout' page just needs to confirm the total price, inc VAT/delivery, allow the user to select various shipping methods (so the total would need to update automatically, and get the customers details (to be passed on to the payment page)
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