You need to install the Venmo or Zelle app first – so I can’t really help you until you do that. Zelle app goes through the Apple store.
I will never need to see your banking information. It’s completely secure from your end. You’ll need to pay after each session. I will confirm that I received payment. I realize it may look like a pain when you click on the link, initially, but you can use both of these (especially Venmo!) to pay friends and relatives, especially if they are on the younger side.