When you arrive at a participating location, you will get a text reminder if you have not yet added a credit card to your profile. Once you sign in and complete this part of your enrollment, you can proceed with the transaction.
Please note that, for security reasons, your on-arrival text notification expires after 10 minutes. After completing your enrollment, you may need to drive under the RFID reader again to receive a new on-arrival text so that you can make a fuel purchase.