Fri Aug 29, 2014 8:16 pm by Koenaj
Are you sure you're on a stable internet connection?
Other than that, the only thing I can think of is do the following:
Go to the App Store and log out. Then close the app and force-kill it (double tap the home button). Shut down the phone and connect it to your PC via a cable. When restarting your phone, log back into the App Store, make sure you have a solid internet connection and try buying coins again.
Good luck!
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