Automatic google merchant discounts

[vittoriocitro]

Hi, I'm configuring automatic discounts for Google Merchant Beta. I set up the token validation correctly, so now my site (www.vittoriocitro.it)  recognizes the token, and extrapolates the discounted price. Now I'm stuck at the point where the site needs to show the discounted price on the product page, in the cart, and then make the customer pay the discounted price. Has anyone already done this procedure? or do you have skills in creating APIs and JS to be able to make this change?