Problem with the NCsoft Store?
How "recently"? If it's within the last 24 hours, he just may be at his daily limit (set seemingly randomly by NCsoft).
However, I've seen lots of complaints recently about the NCstore, so it just may be broken.
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"We're sorry, but we are unable to accept your order at this time. Please try again later or tomorrow. If you continue to have problems, you may wish to visit one of our retail partners."
I just had this hit me as well just now as I tried to buy the Mutant pack

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Hey guys, I have a friend who was using a trial account and recently upraded to a standard one. Now he is trying to buy the ninja and mutant booster packs but keeps getting the following error when trying to pay:
"We're sorry, but we are unable to accept your order at this time. Please try again later or tomorrow. If you continue to have problems, you may wish to visit one of our retail partners."
So I offered to buy it for him on my computer, and I'm getting the same issue aswell.
Is the store offline or is it a bug to do with the fact he was a trial account?