Everyone signs a waiver, so we collect their email address from that and add them to an email promotion list. So I guess the technology would be the mighty pen

Everyone signs a waiver, so we collect their email address from that and add them to an email promotion list. So I guess the technology would be the mighty pen :) We did have a few cases where we caught people... We just called them out and they paid. We are lucky because we have everyone's contact info and keep good records.