It is not allowed to resell tickets by ticket selling websites. The transfer of tickets is solely done by contacting firstname.lastname@example.org
and notifying them about the upcoming changes that you and the receiving party agreed to swap tickets.
Payment of those swapped tickets has to be done between the parties, Reffurence will not ask a(n extra) payment for the services of changing a reservation.
Tickets (including all extras and bookings attached to them) can be transferred.
Both parties must send an e-mail to email@example.com
using the e-mail they signed up with, along with their user id's, (which can be found on their account page) to confirm the transfer. The registration team will then transfer the registration.