You keep money loaded onto it from a credit card and you just pay from your phone when you've ordered. You drive up to the window and get your drink and drive away. It's pretty awesome.
We drove away and William yelled, "Mommy! You stole that coffee! I don't want to get arrested!" I explained how I paid this time and he didn't like it. He needs to see the money exchanged, I think. To keep his stress level down, I'll pay the old fashioned way when William is with me. Otherwise, I'm going to be super high-tech and crazy lazy. Oh, yeah.