What is the ruling on a husband working for a Canadian company that relies on collecting points from customer transactions, knowing that some customer transactions include the purchase of alcohol and pork and dealing with usurious banks, and the husband will be working in the specialized studies department and has no relation to the forbidden transactions?

If your husband's study is limited to permissible transactions, there is no harm. However, forbidden transactions in a company may not be limited to alcohol and usurious banks, but also include competitions and raffles based on gambling. So, if his field of work is permissible without cooperating in anything forbidden, then there is no blame on him for what he earns from it. However, if he finds work in an entity that does not deal with forbidden things and does not assist in them, that would be more preferable.