There are several reasons to link an RFID card to your charge payment provider.
While many people use the app provided, it is sometimes the case that in country areas, mobile reception can be sparse and it is difficult to use the app without connectivity. An RFID card will get you charging with a simple swipe at the charger.
If you have several EVs you may want to keep RFID cards in the car for charging - possibly for family members who drive the car and do not have charge apps installed on their mobiles.
Another reason may be rationalisation - I have several charge cards and by amalgamating some of them into one I can lighten my clutttered wallet.
A third reason is cost - it is not expensive by any means but some providers, such as Chargefox charge around $10 for a card and since RFID cards are fairly commonly used for public transport, one can use them as long as they support the Mifare technology. Some providers such as EVIE supply cards for no cost
But what is an RFID card?
An RFID card has the same dimensions as a credit card
It is a card that is passive - ie. it contains no power source.
It stores information - for example it can store a member number or other identification information.
How do you link an RFID card to your provider?
The first step, on your mobile, is to load up an app called NFC Tools or equivalent app which are capable of reading the RFID card.
Firstly run the app and then when prompted hold the card to the back of the phone
Using the serial number shown in NFC Tools ( without the colons ), add this RFID card to your Charge provider app - I will use Chargefox as an example
Choose the "My Profile" menu option
tap on "Add Card"
Add the RFID card serial number from NFC Tools and press submit - it is now linked to your charge payment provider and you can use it to initiate or stop charging your car!