get
Check-in date for hotel stay in an ISO 8601 Date format YYYY-MM-DD. This parameter should be used in combination with the checkOut parameter. If checkIn and checkOut are not included, a dateless search will be conducted which returns a Featured Offer for each of the hotels found. If one of checkIn and checkOut is not included, an error will be returned. The maximum advanced search window is 500 days in the future, and the maximum length of stay is 28.