PayPal will be undergoing scheduled maintenance and Niconico users will be unable to purchase premium content during the following times:
April 15, 3:00 - 7:00 PM
April 17, 300: - 5:30 PM
Note that these times are in JST.
Everything should be back to normal by the weekend.
That's all for this update! Now go forth and Nico!
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-Niconico