After years of fans requests to connect online Nintendo accounts, Nintendo finally responds by introducing the ability to create a Nintendo Network IDs used connect eShop digital balances.
If players own both a Wii U and 3DS, then creating the same Nintendo Network ID brings together both accounts and combines any eShop balances existing on either platform. A future update prompts singular 3DS owners to create a Nintendo Network ID, regardless of if they own a Wii U. Unfortunately; the connected Nintendo Network IDs offer limited functionality.
As time progress, Nintendo promises to integrate their online accounts into more services. To further connect the Wii U and 3DS communities, Nintendo plans to release Miiverse for the 3DS.
Since the same pool of money now exists on both platforms, Nintendo begins the sale of 3DS and Wii U eShop cards to offer digital credit. The eShop cards come in a variety of balances and designs. Players can learn more information about the gift cards on Nintendo's website.