Availability is used to update Stay Restrictions to the SynXis CR. This message is used to communicate updates to: Hotel, Room, Rate, Product, Rate Category, Sell Limit, Sell Threshold and Open/Close stay restrictions.

The OTA_HotelInvBlockNotifRQ may be used to send a notification of one or more new inventory blocks. This message may also be used to modify or cancel one or more existing inventory blocks.

The ARI Sync-Inventory (HTNG) is used to notifiy a booking source of the inventory amount available at a specific hotel property.

The ARI Sync - Rates ( HTNG) is used to communicate the creation of new rate plans and modification of existing rate plans for one hotel for one rate plan.

The Hotel Descriptive Content Sync API (OTA_HotelDescriptiveContentNotifRQ) is used to communicate hotel-level information to SynXis CRS.

The PMS Reservation Sync (HTNG) (OTA_HotelResNotifRQ) API is used to communicate reservation data from a PMS to SynXis CRS.