WHMCS plugin integration with configuration addon

Please go to:
http://www.crea-factum.com/account/?whmcsportal%5Bpage%5D=whmcs%3A%2F%2Fwww.crea-factum.com%2Fwhmcs%2Fcart.php%3Fa%3Dadd%26pid%3D1

Then please go:
https://www.crea-factum.com/whmcs/cart.php?a=confproduct&i=1

The cart on the right does not automatically update when you add products.

Also how to I get the WHMCS integration to work with the https: version of everything.

Thanks