Checked with our porgrammers, and everything seems to be working properly.
I don't think the unique characters will cause a problem. We have one Swedish affiliate in particular who does dozens of credit card sales a month. And those characters don't seem to cause a problem (he also runs a Norwegian site and hasn't had the problem)
The best suggestion I can make it to make sure he is inputting the correct address. Perhaps there was a misspelling, a wrong number, or maybe there was a move and the address wasn't updated on the credit card.
Try it again and double check these potential problems. I'll continue to research any potential problems on my end. Let me know if it doesn't work for you again.
Scott
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