On the Cloudbeds channel manager rooms and rate plans have a one-to-many relationship. This
means that a room has one or more rate plans, and each rate plan has
exactly one room. For the ARIUpdate calls we can send different
ota_rate_id values for the same ota_room_id. Rates and restrictions are
tied to rate plans, while availability is tied to rooms, so the units
will be constant across different rate plans for the same dates and for the
same room, but rates and restrictions can vary. To close off a rate plan we
are using the close flag.