The Change Discovery (OTA_HotelCacheChangeRQ) API is used to query SynXis CRS to identify rate and availability changes in SynXis CRS, so that the partner can send a targeted shop to SynXis to get the updated availability.

The Hotel Availability Request message provides the ability to search single or multiple properties for detailed availability and pricing information. The request is flexible allowing for multiple ways to search for hotels, filter the rates returned and specify the response type.