Update. It will absolutely not work paying for gas thru the app at the station I use most. Exxon and management of the station have been told many times over the last few months. They do not care. Update again. After several calls to Exxon, several emails and calls to the retail operations director, I've come to the conclusion that this will not be solved. Completely useless at that station. 100% garbage. Hasn't worked since they changed the pumps in October. They DO NOT CARE!