Demandware Ecommerce fix

Hello, This is the product page I am looking at: [login to view URL] There is a way on demandware which is the CMS [login to view URL] uses to add shoes to cart with a cart url. Putting this URL ([login to view URL]) would automatically add a shoe size to cart except that there is a captcha. There is a way to incorporate the data-sitekey into the URL to add the shoes to cart. The sitekey is 6LekiwgTAAAAAALUnAZQuJEvFG7O5z-gKGEjtz82 which can be seen in the source code. I am looking for the URL with the key that can add the shoes directly to cart.