According to GoodToGo:
What if I already drove on a toll road or have unpaid toll bills?
Don’t worry, it’s not too late to save money. We’ll lower any unpaid
tolls and you’ll pay the reduced toll rate as a part of the account
What you’ll need to tell us to finish this step-by-step process:
- Vehicle information – Make, model, color, year, and license plate number.
- Payment information – A valid credit card, debit card, or checking account information (bank account number & routing number).
Its super annoying that you can’t just pay by license plate but I guess they did it to avoid bots harvesting data on which car drove through the tunnel on which day.