What is the ruling on working for a company all of whose transactions are conducted with usurious banks via credit cards?

It is not permissible to work in anything that directly involves riba (usury) or assists in it, based on the Almighty's saying: "And do not cooperate in sin and aggression." The Messenger of Allah, peace and blessings be upon him, cursed the one who consumes riba, the one who feeds it, its scribe, and its two witnesses, and they are all equal in sin. Therefore, as long as the company's work is confined to serving usurious banks regarding credit cards, it is not permissible to work there.