What is the ruling on working for a company that manages electronic purchases via bank cards, given that it deals with cards from both Islamic and usurious banks, provides devices to stores, obtains a commission from each transaction, and sometimes prints some bank cards?

The company provides devices to merchants for inserting cards and ensuring the completion of transactions for all parties. There is no harm in this, and taking a commission for it is also permissible. As for printing bank cards or delivering them blank to banks, it is obligatory to restrict this to banks that do not deal with forbidden cards. It is not permissible to print an interest-based card, as that involves assisting in sin. It is also not permissible to work in maintaining devices used in interest-based banks, nor to sell cards or devices that an interest-based bank uses in its transactions.