maybe you have a similar thing in India. Here in Germany there are several providers for charging services. They offer apps as well as transponder cards/transponder chips. With those and a proper account/contract you can use the charging stations within the network of the provider:
two things are remarkable about the system:
A) Some chargers can be used for free (see my related post). However you sometimes need a transponder/registered App to launch the free charging. In this case it is always good to be registered with some of the providers to receive the card but without monthly fee. These providers offer the service, but the kilowatt hour price for regular charging will be higher than with a monthly fee contract. Great to have several of these cards, as you do not pay basic fee, and you normally are then in a position to activate the free charging point.
B) so-called flat rate cards. Basically they can do the same as mentioned in point A). However you pay a monthly constant fee and the card allows you to charge as much as you want to in the month. I don’t know the intention of these systems. I guess the calculation is to get customers also for home electricity. Or to earn money as some people charge less than they pay per month. In our case we use a flat rate card where we pay €15 a month . That’s really not a lot of money (100km of charging of Tesla Model S is ~6-7€ In electricity in 🇩🇪 ). However the network/amount of charging points is limited for this card. But it covers very well our operational area and one charger is 300m away from our home.
This kind of deals make e-Mobility even more attractive. Especially if you consider the fuel price per 100km was about 12€ with our ICE family car...
Flat rate charging during shopping near our city center...
Flat rate charging at a charging point in Hamburg (Hanseviertel Parkinghouse) during shopping