Paypal Button On Product Page

Hello. I want to place on the product page Paypal button with a direct link to the payment without baskets and other problems. The problem is almost solved (though artisanal) and the button works. BUT, provided that the product has only one option. Purpose: to update the data in the button when one of the 2 or 3 choices of goods. Now this is done via AJAX to the primary button "Add to Cart". Looking for information: price and product version of himself.