This is the Authorization key. You have to add it as a GET parameter.
Your auth key can be found on the [CMS](https://www.pro6pp.nl/cms).


authKey

This will give autocomplete suggestions for Austria settlements.


The address's settlement (city, town, village, or hamlet)


settlement

The address's postal code which consists of four digits


The amount of results returned, a number between 0 and 999.


The page to return, the variables for the next/previous pages can be found in the results Link header.
