I need you to develop some software for me. I would like this software to be developed for Mac -- 3

I want to create.. a script that will take a product URL and be able to then add the item to cart and then further the checkout process automatically. For example we will be making the script for this site..and using this specific page. ([login to view URL]) Once that product goes live i want the script to have all my info pre loaded like card info,billing,shipping address,personal info,size of the shoe etc.. (for example info needed to place order) it will automate the add to cart process so the product will be added to my cart and will then go on finishing the checkout process all automatic by entering things needed to finish the process to checkout and make sure order is complete just like someone would be checking out a product on a normal site manually..by entering all that info needed to place order BUT... the script will do it automatic.