Hi! My question is:

Is it possible to updating taxes after selecting country in shop/checkout ? 

I want to set taxes on 23% if customer will select Poland in form. I tried to do it calling python method from javascript and updating field amount_tax in the database, but first i don't know how to get id of modified order and second I can't call method from js if I'm not logged (customers are not logged). So, is there any other solutions for this?