Is it the card number error message or a different error message? I have a card that never works on the DVC site. It works on all the other Disney sites, I’ve paid for dining plan with it through member services but never been able to use it to pay annual dues (on the phone or online). This is just part of the mystery that is Disney and I simply use a different card.
I tried paying and had it error out on my 3 time the other day.
I logged out
Cleared cookies, site data, and cache
logged in and it went thru.
Don't know if it helped or if it was just timing.