Since the App contains all the time and cost information shown on the road signs, even if you started parking at 07:30, the cost will be calculated only from actual time of validity, thus in the specific case from 08:00.
The cost and times of parking are defined by each municipality and the related information is shown on the road signs in the street parking area.
The App allow you to always preview the cost before you initiate parking. On the other hand, in the Reserved Area of the site you can review all your activity.
Parking assistants are equipped with a handheld device on which they digit the parked number plate and verify the payment in real time. In some municipalities (indicated by an alert on the App), you are required to display the Telepass coupon on the windshield.
Make sure to always display the Telepass coupon on the windshield of your car. Failure to display it in those Municipalities that require it could result in a penalty.