To get hold of the information about your car including the detailed configuration taken from Teslas option codes has become increasingly difficult. If you enter you mytesla login details or token we can query the API for you however the information that is currently returned by Tesla is now wrong. We will return what informtion we can using that method but this won't help with the supercharging status.
The only way we know of without contacting Tesla is to get hold of the option code string via myTesla. Log into the account and click on ViewDetails for the chosen car, on the page that is returned you need to examine the HTML and select the configuration codes that follow the word "OptionCodes" in the text. Copy these codes and drop then into the bottom box on this page. We will convert each option code that we recognose, one of which is typically the supercharging status.
There are three general classes of supercharging, paid for charging, free for the first owner which reverts to paid when the car is sold, and unlimited free. It used to be fairly easy to tell which a car would have from its age. but Tesla are now removing unlimited free supercharging from their CPO cars and so you need to check if you are thinking of buying any car.