I had same problem on the north of the Europe (Norway, Finland, Sweden). It really sucks! In remote locations there are only unmanned petrol stations, so you have to use different card.
Even if there is regular manned station nearby, fuel is more expensive. And again, you are supposed to pay at the fuel stand. So, you have to go inside the shop, have a chat with a salesman, explain the situation (again, again, again, every time you need fuel) and then you can leave shop to fill up your tank and go again inside to pay.
I really wish this would be allowed. Anyway, I do not see any reason - I can pay inside (if there is any “inside”). So what is the reason to deny the automatic payment???