Incluyendo nuestra clase de opciones
<?php
add_filter( 'woocommerce_get_settings_pages', 'holadolly_include_woocommerce_setting_file' );
function holadolly_include_woocommerce_setting_file ( $settings ) {
$settings[] = include( HOLADOLLY_PLUGIN_DIR . 'class-wc-settings-holadolly.php' );
return $settings;
}