Checkout script for website

I would like a program that will do the following. Please read very carefully. I am looking for a very basic program that will purchase an item on a website(please contact me to know what site) on its own. The user would provide several attributes to the program in a .txt file. 1)Product URL 2)Product Size 3)Customer billing info (Email, name, address, phone number) 4)Customer Shipping info( Name, address, phone number) 5) Customer payment info( Credit card number, expiry, CVV, zip code, name on card) Using the above information, the program should do the following on its own after a user input such as "start" 1. Go to the product URL 2. Select user specified size and Add the item to cart 3. Go to checkout 4. Autofill in billing, shipping and payment info 5. Complete the purchase. I am NOT looking for a website to be made, i am NOT looking for any sort of ecommerce platform to be made. What i am asking is straightforward, please contact me if you know what I am looking for and are able to make it. It should be a fairly simple task.