HOW DO I REDEEM A Nintendo Codes?
A) On Nintendo Switch Console
Go to the Nintendo eShop from the Home Menu.
Choose your user profile.
Select Redeem Code (or Enter Code).
Input the 16-character code (no hyphens).
Confirm, and your balance or content will be added.
B)Online via Browser
Visit the Nintendo redeem page ( https://ec.nintendo.com/redeem/#/ ) in a web browser.
Sign in with your Nintendo Account (must have accessed the eShop at least once).
Enter your 16-digit code and click Next.
Re-enter your password if prompted, then confirm the redemption.
You will receive a confirmation email.