class Geocoder::Lookup::MaxmindGeoip2

def configured_service!
  if s = configuration[:service] and services.include?(s) and configuration[:basic_auth][:user] and configuration[:basic_auth][:password]
    return s
  else
    raise(
      Geocoder::ConfigurationError, "When using MaxMind GeoIP2 you must specify a service and credentials: Geocoder.configure(maxmind_geoip2: {service: ..., basic_auth: {user: ..., password: ...}}), where service is one of: #{services.inspect}"
    )
  end
end