Hi Stan,
We are using OPC, combined with the FedEx shipping module and EU Vat Checker. Initially we had a single problem but I fixed it, I am posting this here so others might find a solution or offer a better one.
Our problem was, that the VAT was updated correctly (removed or added) when the user would fill in his VAT Checker ID, however, the VAT Checker plugin works in such a way that it updates the shopper group which has certain tax applied yes or no. This, however did not work when filling in a country outside Europe, normally the VAT checker also takes care of that, but not in this case.
I did a search first, and found this topic:
viewtopic.php?f=3&t=749&p=2472&hilit=vat+shopper+group&sid=297d7c936747aef8d6a4026683a35a27#p2472
But there was no awnser.
I checked the EU Vat checker tutorial configuration:
http://extensions.virtuemart.net/all-tu ... at-checker
And discovered I could also tweak the VAT applied to specific countries, which does work with OPC. Even combined with the VAT checker.
Still it was a bit odd. Is there no trigger to change the shopping group (does not pay tax) based on the country in OPC or somewhere else?