I paid once and it looked like it went through on my side. I was told it didn't go through and had to try again. I then used my card since I thought it didn't work since I had no data and it worked with my card. After that, I just used my card when I had no data.
I have no idea. They make it sound as if these are something new but its been around. I failed my 1st test but passed the second time. Maybe everyone was expecting the old paper test and was surprised. That happened to me.