For an OBE implementation there are two requests to perform when information about availability and prices are needed.
The OTA_HotelAvailGetRQ provides the ability to request availability details for hotel properties by specific criteria that may include dates, date ranges, rates, rooms and products. For example to fill calendars on a Booking Engine.
The OTA_HotelAvailRQ requests availability of hotel properties by specific criteria that may include: dates, date ranges, price range, room types, regular and qualifying rates, and/or services and amenities. The availability message can be used to get an initial availability or to get availability for the purpose of modifying an existing reservation.
The OTA_HotelAvailRS returns information about hotel properties that meet the requested criteria, indicating whether the requested service, rate, room stay, etc. is available within the date(s) specified. The response message may include Warnings from business processing rules, or Errors if the request did not succeed.