Some OTAs only tie one property to a specific login username/password where
the username is also the ota_property_id. Others allow for one
username/password to be associated with multiple properties. In this second
case, each OTA property identifier is stored as an ota_property_sub_id in
order to be handled separately from the property's OTA username. This method
call should return all of the properties (ota_property_sub_ids) associated
with the OTA's username/password so that the correct ota_property_sub_id
can be linked with our mya_property_id for a specific property.

IMPORTANT: Please contact us to enable this feature for your OTA. It is
NOT enabled by default. It is only necessary if your OTA allows for
multiple properties associated with one login username/password.

Implementation suggestions: ota_property_sub_id will be the OTA identifier
for a specific property managed by the hotel while the title is that
property's name. This method will allow the property to map their
Cloudbeds property with the OTA's ota_property_sub_id when setting up
the property-OTA association on Cloudbeds.