Paypal ExpressCheckout

-- url of the page with the problem -- : www.lasegretissima.com
-- HikaShop version -- : 2.4.0
-- Joomla version -- : 3.4.1

I installed HikaShop Paypal ExpressCheckout payment plugin
I Integrate button Paypal ExpressCheckout payment in the page of products but the plugin does not allow it, I need the code html to embed this button in each product page so add the product and go directly to the payment without going to the cart.
I await a solution
thanks

Hello,
Note that a better solution can be to directly add a cart module through your product page so that when you customer add your product on his cart, he'll be able to directly use the PayPal button through your cart module.