Thank you all for your very helpful suggestions
You can booked ahead or either when you arrive you can pay at Bell Trans Desk
Go outside Door #12 if arriving in Terminal 1. Ticket booth is right outside door. You can pay cash or card.
Shuttles are there 24 / 7
You'd be far better off taking a taxi at that hour. Vehicles become sparse at that hour and it COULD take in excess of an hour to arrive at your hotel. Then again you could get lucky. Flip the coin.
Like Adrian said 24/7
Thanks! Your answer is awaiting moderation.