My daughters and I have been passholders for several years, but when my husband joins us and we buy him just day/multi-day tickets, my memory is that they can be scanned directly from your phone at the main gates or GCH entrance. Then you are given a ticket. Someone correct me if I'm wrong, but I'm 99% sure this is what we did last time he went and it was at the GCH where we were staying. No need to visit the ticket booths in the esplanade.