Not sure on the toll process where you live but here in Texas they register your car plates in the system so when you pass it always takes a photo of your plates and if the car sticker does not register in their system the photo of your plates completes your toll process.
I never attached mine to the windshield and pull it out of my center console when on toll roads and place on my dash but sometimes have forgotten and never received any notice in the mail and see they deduct my toll from my account.
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