Hello,
The Nintendo eShop will be offline at different times around the world to manage traffic volume until full operation is restored. It's currently offline between 4 p.m. and 4 a.m. ET.
Service availability has been improving, and we ask that, during uptime, you try accessing the Nintendo eShop again to complete your transaction. For current status and availability, you can visit http://support.nintendo.com/networkstatus.
Thank you for your continued patience and support as we work our way through to a resolution on this issue.
Thanks,
NOA_TECH_JANE