Endpoint: https://api.myallocator.com/callback/ota/{ota}/v202203 (replace {ota} with your channel ID)

Use this callback to check if a room (rateplan) is available for booking.

Although information about specific room (rateplan) availability is supposed to be present locally on a channel side, we would like to provide an opportunity to double check if a room (rateplan) is available prior to creating a reservation. Using this callback ensures that due to a possible technical issue leading to a room (rateplan) availability numbers not having been (or having been incorrectly / not in time) delivered to a channel, the room is not overbooked and therefore helps avoid both host and guest frustration when such an over-booking has to be canceled by a host due to physical inability to accomodate.

Identify the property with ota_property_sub_id if your OTA supports multiple properties under one login (see GetSubProperties), otherwise with ota_property_id. Exactly one of the two applies to your channel, and sending only the other one is rejected with error 1187.