I'm trying to migrate my 5-man to another server, but after I migrated the first two I got:
Payment rejected

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But there are no details below.. :P
I've read up on some other guy who had the same problem, but no solution was described.
Someone suggested that it might be some sort of "anti CC stealing"-guard that blocks your payments if you use the same credit card several times, either from the banks side or from Blizzards.

I'm not all that keen on paying with a friends card either, heard about people that have gotten their accounts locked up for investigation when they payed for different services with different credit card owners.