· Charging via the official website:
1. Visit the official Nintendo website [https://ec.nintendo.com/redeem].
2. Log in to your account or create a new one.
3. Enter the 16-digit coupon code and click Next.
4. You'll be prompted to re-enter your password, so do so.
· Charging via your Nintendo device:
1. From the home page on your Nintendo device, select the Nintendo eShop icon.
2. On the left side of the screen, scroll down until you reach Enter Code.
3. Enter the 16-digit coupon code and click Next.