Dumb question: how do you pay at Love's truck stop?

Ok. I assumed he was in the rig but, yes, was likely inside paying, mystery solved. Yes, this is the first time we have taken the RV farther than 3 hours. We are finding out that fueling up is a hassle in some places. We didn't unhook last night-- just stopped for 8 hours. I can see how unhooking would provably be easier,