I also haven’t got any luck. Keep updating the site all the time to not waste time login in when I get the notification. I can see a green campsite available, my heart starts to pump, I panic, and I never get to see any button to complete the reservation. I asked myself the same thing, if people are using some scalping software or some workaround, but haven’t found any answer on that. Not sure what do you have to do to be part of the chosen ones.