I found out a problem that in Flat rate->Additional Rates,
if I put the extra shipping option in it which contains Chinese,
it will end up a "invalid shipping method" message when I press "place order" after checkout.
超商付款取貨|20|order <---contains Chinese character will get error
POD|20|order <---- in english is normal
I did some search that some guy had the same problem as in Russian or Hebrew.
Is there any way to resolve this problem?