The practice of charging attraction operators an additional fee for bookings that originate through online travel agency (OTA) channels, such as Viator, GetYourGuide, or Booking.com. When a booking platform also has an OTA relationship, operators may end up paying the platform's standard transaction fee plus a separate OTA distribution fee on the same booking. This fee structure can significantly reduce the net revenue per booking and is a common source of financial friction for operators who built their distribution strategy before the OTA fee was introduced.