The availability resource contains two elements: Number of Units and Offers.

Filtering properties

Apart from the basic required parameters like check in and check out, you should specify either a list of property ids to retrieve, or geo coordinates and radius of a location you want to search in.

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List size

The maximum number of property ids you can pass in each request is 50

Passing property ids

The way the Katanox API expects arrays is the following:
/v2/availability?property_ids=ABCDEFGH&property_ids=IJKLMNOP