Purchase Failed-We're Sorry But The Transaction Was Not Successful.

Having the same problem.  I'm guessing it has something to do with the iOS update pushed yesterday.

On a side note, I'm surprised that EA is paying little attention to this problem. Considering that a) this is week 2 of the playoffs; and b) the Playoff Packs were just posted in the store (and expire Friday), this 48hr window provides huge profit-making potential.  To have this service down during this time (and particularly, for so long), EA is certainly losing big bucks (no pun intended).