Automated Purchasing Software

I need a software that can go online to a large retail website and process purchase orders one after another. I have a spreadsheet that contains the following information. Product url Ship to info account login info return address payment method Each row contains all of the above info for one purchase. One spreadsheet would have 200 to 10,000 rows of orders to process. The software needs to do the following land on product url add to cart login to account apply appropriate payment method paste in shipping info past in return address info paste in gift note (from spreadsheet) checkout and repeat... The software must be very stable and process everything automatically until complete.