Go to Nintendo eShop on your console or device and log in to your account.
Select "Enter Code" on a Nintendo Switch or "Add Funds" on a Nintendo 3DS.
Enter your 16-digit activation code that you received from us.
Press A and the funds will be added to your account.
Validity: This Nintendo eShop Card does not expire. It can be redeemed in any country using the same currency as the card....