I just wanted to let people know that i was successful buying a ticket online through the Trenitalia website. I have read that some people have had trouble with the Trenitalia website in terms of buying tickets. Many people say just buy the tickets when you get there but i believe buying early, if you have definitive plans set, works well. I saved 51 Euros per ticket and bought two tickets.
Note that i used a Mastercard with a chip and bought the ticket from Canada.