You might want to check the services they provide (I did not see them having what you are looking for), and then maybe contecting their support for more assistance.
Anyways, you could easily use any Reverce Geocoding service which provides REST interface for determining the country (and actuall more accurate address), thus I would suggest you reconsider the requirements on utilizing the original provider for the purpose.
If for some reason you need to have a certain Geo-location for all users in same city, then after reverce geocoding the city & country, use those values (without any actual street address) with geocoding service to get the 'center' of the city.