Great script, thank you for your time and hard work!
We are trying to figure out how to make your system work for us.
We have two taxes that need to be adjusted/removed differently when shipping items to USA, Europe and Canada. Rather than setting different item taxes on every transaction, we have tried to leave the item taxes blank, and simply change the default store tax amount in "Store Config" for transactions with odd tax amounts. Unfortunately, this has no effect at all in calculating the taxes. Is there a way to make this work as intended?
Thanks in advance for your help!