What is the ruling on working for companies specialized in digital payment technology and banking systems, such as those that maintain and operate the infrastructure for payment systems between banks and retail merchants, and what is the ruling on a wife eating and spending from the money of her husband who works in this field?

It is not permissible to work in companies that provide services to usurious banks, because it involves cooperation in sin and aggression.

It is not permissible for the wife to eat from her husband's unlawful earnings, except in cases of dire necessity. She must demand that he provide for her from lawful earnings, or she should take her case to the Sharia court.

It was stated in the Maliki books that a righteous wife of an oppressive husband who refuses to divorce her may eat from his wealth, and his sin is upon him.