What is the ruling on a hotel using a payment system with bank cards, the funds from which may be used in usurious investments, and what is the ruling on working in this hotel and receiving wages for it?

Firstly: It is permissible for the hotel owner and the seller to collect the rent or the price of the goods from the customer via bank card, whether the transaction is permissible or forbidden, because the sin of what is forbidden in the latter case falls upon the bank and the customer, and they have no relation to it.

Secondly: There does not appear to be a reason to oblige your father to withdraw money daily from the bank due to the hardship involved, and it cannot be definitively asserted that the bank benefits from his money in usurious dealings. The sin of usury falls upon the bank, not upon your father.

Thirdly: There is no harm in your working at the hotel and receiving wages for it, because your wages are for permissible work that you perform.