GAZ

I am looking for a program to automatically check item in stock only sold by [login to view URL] and add item to cart and check out . The system should check the availability of an item in [login to view URL] every one to twenty second, and add it to shopping cart and check out automatically . I should be able to set up price critera based on the selection I am watching, quantity of item added to cart, payment method, shipping method. The system should be able to use up to 20 [login to view URL] account at the same time. I can provide you two similar softwares,which you can use as a reference. but i want your software performs faster than those two softwares.