Multiple Store Services - All users are affected
Customers may be unable to make purchases from the App Store, iTunes Store, iBooks Store, or Mac App Store.
In addition to the Stores being down, developers are reporting that they are unable to log into iTunes Connect or use TestFlight.
We'll let you know when things are up and running smoothly again. In the meanwhile, check out Apple's system status page for more details and please follow iClarified on Twitter, Facebook, Google+, or RSS for updates.