my $client = Google::Ads::AdWords::Client->new({version => "v201409"});
$client->set_developer_token($clientSettings->{developer_token});
$client->get_oauth_2_handler()->set_client_id($clientSettings->{client_id});
$client->get_oauth_2_handler()->set_client_secret($clientSettings->{client_secret});
$client->get_oauth_2_handler()->set_access_token($agent->{access_token});
$client->get_oauth_2_handler()->set_refresh_token($agent->{refresh_token});