Forgot to pay nh toll

I live in Massachusetts and went on a little trip through New Hampshire a few months ago and completely forgot to pay my toll online and now it's past the 7 day window. I had received an invoice in the mail but had lost it and I am unsure how to pay the toll as the website requires the invoice number to pay it online. Does anyone know how to find the invoice number or somehow pay it without it before it escalates? Any help is appreciated.