You can download and install Exxon Mobil Rewards+ mobile app on both iOS and Android smartphones. After installing, you have to create your account as mentioned above.
Instead of a card, you will have your phone number as ALT-ID through which you can make payments without having any contacts.
After this, you can pay for your transaction each time just by clicking on the PAY NOW button. You will then earn points on fuel purchase, car wash, convenience store purchase.
You can also make payments by entering your 4 digit PIN CODE or by scanning the QR CODE. Hold your phone 2 inches away from the QR CODE of the Pump. The app will automatically scan the QR CODE and it will select the pump number.