After you have completed the purchase, the content will be downloaded to the applicable system linked to your Nintendo Account, or your Nintendo Network ID in the case of Wii U or Nintendo 3DS family systems.
Please make sure you have enough storage to complete the download. Depending on the system/console/hardware model you own and your use of it, an additional storage device may be required to download software from Nintendo eShop. This system must be updated to the latest system software and connected to the internet with automatic downloads enabled, and it must have enough storage to complete the download.
After the purchase is completed, the content will be downloaded to the applicable system linked to the respective Nintendo Account, or respective Nintendo Network ID in the case of Wii U and Nintendo 3DS family systems.