Dubai Metro Day or Week passes?

ng Dubai soon for a stay of just under a week so is there any options to buy a day ticket to travel through all zones on the metro? Or week passes even? Please forgive me but I would very much appreciate it if someone could ElI5 (short summarise) which pass I can get at what price, I'm from the UK so if I were to use a card to checkout there, would the fees be high? Can I pay with cash at a ticket office to retrieve a day/week pass? Thanks!!