Symposium is accessible to all the world. Anyone can use it to book with our users, and that’s a beautiful thing. It also means there’s a lot of opportunity for people to book up time and never show up, effectively walling off Hosts, and blocking access to them by those who are serious about scheduling and attending, or are in need of important services. We want to protect you, our Hosts, and all of our other users from this, so we require a payment authorization for every booking 24 hours ahead of start time. In order to ensure the authorization goes through, we require a card on file at the time of each booking.