if($form_id == 'commerce_checkout_form_checkout'){
    $form['employees'] = array(
      '#markup' => '<h1>Hello, this is a checkout test!</h1>',
      '#weight' => -1,
    );
    $webform_nid = 324;
    $webform_node = node_load($webform_nid);
    $webform_components = $webform_node->webform['components'];

    foreach ($webform_components as $key => $component) {
        $form[$component['form_key']] = webform_component_invoke($component['type'], 'render', $component);
    }
  }