The key you want to use to authenticate with the service (you can request we create one for you or create one in your account section).
Inputstring[]
An array of strings containing either location co-ordinates and/or unstructured addresses. This array can contain up to 10 items.
Countrystring
The ISO2 or ISO3 country code (e.g. GB or GBR). This will limit the geocoding lookup to the specified country, but will improve performance. This parameter is not required for reverse geocoding requests.