May I ask if you pay for the Portuguese highway automatically by electronic means or by staff ?

All have

Electronic artificial intelligence has passed, and electronics need chip cards

There are two types: electronic and artificial. After buying the electronic ticket, you still need to register and activate it by entering the vehicle number. You don't need to cancel. Electronic highways have segments. You need to buy a card according to the number of kilometers you run. The amount is different.

After returning the car, unbind it. There is a website called essytoll. At that time, a small piece of paper with a number on it was printed out and bound to a credit card. It needs to be input.

May I ask, do I need to unbind the credit card I bound before returning the car?