ExampleConfigEntityInterface.php

<?php

namespace Drupal\ctools_wizard_test;

use Drupal\Core\Config\Entity\ConfigEntityInterface;

/**
 * Provides an interface for defining Example config entity entities.
 */
interface ExampleConfigEntityInterface extends ConfigEntityInterface {
    
    /**
     * Get first piece of information.
     *
     * @return string
     */
    public function getOne();
    
    /**
     * Get second piece of information;.
     *
     * @return string
     */
    public function getTwo();

}