Make sure it's a Credit Card with a limit, and then a daily spend limit that covers enough, and then some, of the fee.
I tried paying with a Debit Card with more than enough to cover the fee on it only to be told that my bank only allow 90% of that fee due, per day, as a max spend.
Would have been majorly caught out if I was close to the 60 day application deadline.
Advise making any payment early to allow for any banking issues. Oh, and tell hubby currency conversion fees are the least of his migration cost worries.
B