This is not a full working module. This is a improvement to Tsimi "Modular Shopping Cart BS": I upload it as a guide for developers who want and can adapt it. The improvement avoid to change core file checkout_payment.php, using a header tag module. You can see the origin here: "B ) Instead of modify checkout_payment.php, you can use a header_tag module that inject HTML and javascript. I have the module files but... I can't attach to this post!"