layer name

map name. Optional for public HERE maps and for private BYOD maps. If not specified, the content of all maps is retrieved

comma separated list of the index attribute names

comma separated list of index attribute values, corresponding to the attribute names

A key generated specifically to authenticate API requests. For more information on how to get an API key, see https://developer.here.com/documentation/identity-access-management/dev_guide/index.html .
Other authentication options are Bearer token, see https://developer.here.com/documentation/identity-access-management/dev_guide/index.html or app_id with app_code for backward compatibility.