Buying the card number may be a network error or a system problem. You can restart it and then bind it. If not, contact the buyer in time. The sudden failure of the switch credit card is generally a problem of the external network. Sometimes network fluctuation will lead to the invalidation of credit card display. Players can wait a while and try again, or go directly to official website to buy. Do not buy a switch. It is also possible that the service status of the credit card is wrong, so you can contact the issuing bank.
You must use a dual-currency credit card to buy games at switch. Users can't use credit cards to buy games because the credit cards they hold are not dual-currency cards. If a user doesn't have a dual-currency card, but wants to buy a game in swith, he can also bind an online payment service provider and pay with the online payment service provider.