public function total_items()
{
global $wpdb;
if (!get_transient('give_total_api_keys')) {
$total_items = $wpdb->get_var("SELECT count(user_id) FROM {$wpdb->usermeta} WHERE meta_value='give_user_secret_key'");
set_transient('give_total_api_keys', $total_items, 60 * 60);
}
return get_transient('give_total_api_keys');
}