Or if not possible by cap ( italian postal code ) , at least this simple addiction :
<g:shipping>
<g:country>IT</g:country>
<g:service>Standard</g:service>
<g:price> **** </g:price>
</g:shipping>
**** = is the calculated price ( price of the product * 4% )
We will add the max value of % that is 4%
Please give me a quote for this solution if is not possible the above one.
Thanks