In preparation for the closure of the Wii Shop on January 30, 2019, we will be removing the ability to add Wii Points with either a credit card or a Wii Points Card on March 26, 2018 at 1:00 PM (PT). If you’d like to purchase Wii Points, please do so before this functionality is removed. Once you’ve added Wii Points, you can redeem them for Wii Shop content until the Wii Shop closes. For more information on the closure of the Wii Shop, please visit https://support.nintendo.com/wii/shopnews.
Thanks for your support,
Your Friends at Nintendo