Automate product purchase from ecommerce site

I need to automate the purchase of a product from a popular ecommerce site. i will supply the method you create with a url, and a map of information (loginid, loginpassword,shipping_name, shipping_address,credit_card_info). In this method, you will automatically add this item to your cart, navigate the checkout menus entering the relevant information, all the way through to confirmation page. The method will return a True/False success boolean, and the total price charged. This needs to be done in python, preferably with the cPAMIE extension.