<?php
    /* snip */

    /**
     * Adds a new settings tab to the woocommerce settings page.
     *
     * @wp-hook woocommerce_settings_tabs_array
     *
     * @param   array $tabs
     * @return  array $tabs
     */
    public function add_setting_tab( array $tabs = array() ) {
        $tabs[ 'new_tab' ] = __( 'My new Tab-Name', 'textdomain' );
        return $tabs;
    }

    /* snip */