Problem: my Paypal valuta is showing up in Dollars and I need to change that in Euros.
In 2006, someone had the same problem (http://opensolution.org/forum/?p=readTopic&nr=3142) and you suggested to change <input type="hidden" name="currency_code" value="GBP"> inside a file called "message.tpl".
In 2010, same problem (http://opensolution.org/forum/change-currency-in-paypal,6672,1.html) and you suggested to change <input type="hidden" name="currency_code" value="$config[currency_symbol]"> in a file called "order_print.tpl".
Even Paypal support (https://www.paypal.com/cgi-bin/webscr?cmd=p/sell/mc/mc_wa-outside) is suggesting to change that line: <input type="hidden" name="currency_code" value="EUR"> but this goes for paypal buttons and not for redirection as we have in QuickCart.
Now we are in 2013, my QuickCart version is the latest, but there aren't any of those files indicated above. Moreover, in my file lang_it.php I have correctly configured $config['currency_symbol'] = "Euro";
Could you be so kind to tell me what file(s) I should modify in order to have the correct valuta?