I was driving a friend's car without a pass or account
If you're driving a friend's car, you can still buy a pass for your trips—you don't need to be the vehicle owner.
If you haven't managed to buy a pass within the time limit, the vehicle's owner will be issued with a toll notice. If you aren't the registered owner of the vehicle, you can still pay the toll notice online. All you need to do is enter the toll notice number and proceed through the payment process.