Automatic Product Purchase + Checkout (CHROME EXTENSION!

I want a chrome extension that when I click a product on this website: [login to view URL] It will add to cart your selected size, check out, and submit the payment information. I want this extension to be very user friendly with options for your shoe size and places for a user to put in their checkout credentials. Also in order for this extension to work, users must have a access code to use the extension. I will be the controller of all passwords needed to use the extension! If you can do this, I have other website I would like the same exact job for! Looking for a excellent programmer who can finish this simple job in a few days!