Afaik CC companies notify companies about CC number changes. I don't know what the criteria is but the last time my CC got replaced because of suspected fraud b

Afaik CC companies notify companies about CC number changes. I don't know what the criteria is but the last time my CC got replaced because of suspected fraud by my bank, nearly all companies I gave my CC number to had the new number automatically in the respective accounts. If anybody can register themselves to that service, getting a new number isn't really a security improvement. Maybe somebody else knows more about that.