Incluyendo nuestra clase de opciones

incluyendo-settings-class.php

<?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;
}