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  // If the Order UI module is installed, add a local action to it that lets an

  // administrator invoke the checkout completion event on the order. Modules

  // that define their own order edit menu item are also responsible for

  // defining their own local action menu items if needed.

  if (module_exists('commerce_order_ui')) {

    $items['admin/commerce/orders/%commerce_order/edit/checkout'] = array(

      'title' => 'Simulate checkout completion',

      'description' => 'Directly invokes the checkout completion rules on the order.',

      'page callback' => 'drupal_get_form',

      'page arguments' => array('commerce_checkout_complete_form', 3),

      'access callback' => 'commerce_checkout_complete_form_access',

      'access arguments' => array(3),

      'type' => MENU_LOCAL_ACTION,

      'file' => 'includes/commerce_checkout.admin.inc',

    );

  }

/**

 * Access callback: determines access to the "Simulate checkout completion"

 * local action.

 */

function commerce_checkout_complete_form_access($order) {

  // Returns TRUE if the link is enabled via the order settings form and the

  // user has access to update the order.

  return variable_get('commerce_order_simulate_checkout_link', TRUE) && commerce_order_access('update', 3);

}

/**

 * Implements hook_form_FORM_ID_alter().

 *

 * Adds a checkbox to the order settings form to enable the local action on

 * order edit forms to simulate checkout completion.

 */

function commerce_checkout_form_commerce_order_settings_form_alter(&$form, &$form_state) {

  $form['commerce_order_simulate_checkout_link'] = array(

    '#type' => 'checkbox',

    '#title' => t('Enable the local action link on order edit forms to simulate checkout completion.'),

    '#default_value' => variable_get('commerce_order_simulate_checkout_link', TRUE),

    '#weight' => 20,

  );

}

/**

 * Resets the cached list of checkout panes.

 */

function commerce_checkout_panes_reset() {

  $checkout_panes = &drupal_static('commerce_checkout_panes');

  $checkout_panes = NULL;

}

/**

 * Determines whether or not the given order can proceed to checkout.

 *

 * This function operates as a confirmation rather than a falsification, meaning

 * that any module implementing hook_commerce_checkout_order_can_checkout() can

 * confirm the order may proceed to checkout.

 *

 * The default core implementation is in commerce_product_reference.module and

 * allows any order containing a product line item to proceed to checkout.

 *

 * More complex logic can be implemented via hook_commerce_checkout_router().

 *

 * @param $order

 *   The order being confirmed for checkout.

 *

 * @return

 *   Boolean value indicating whether or not the order can proceed to checkout.

 *

 * @see commerce_product_reference_commerce_checkout_order_can_checkout()

 */

function commerce_checkout_order_can_checkout($order) {

  $proceed = FALSE;

  // Manually invoke hook functions to use the bitwise operator that will update

  // the return value to TRUE if any implementation returns TRUE and ignore any

  // FALSE return values if it is already set to TRUE.

  foreach (module_implements('commerce_checkout_order_can_checkout') as $module) {

    $function = $module . '_commerce_checkout_order_can_checkout';

    $proceed |= $function($order);

  }

  return $proceed;

}