I'm looking into integrating Google Checkout into our website. At the checkout stage of our website we calculate the delivery cost based on where they are shipping to, however it appears to me that the user could change the shipping address once they reach Google Checkout i.e the user could indicate on our website that they want it shipped down the road, and then at Google Checkout indicate they want it shipped to Australia!

Is there anyway of passing a shipping address across to Google Checkout, and then prevent the user from changing that address? Failing that, is it at minimum possible to pass the shipping address to GC?