How to execute the code on the "order status change" event in Bitrix?

Question

1C-Bitrix

In init.php, you need to add the code that will be executed when the order status is changed to F - delivered in the admin panel. In this code, you also need to pass the order number for which this status has changed.
As I understand it, you need to write a code for the OnSaleStatusOrder event.
How to execute the code for the "order status change" event in Bitrix?

Answer 1

If the code is needed before the status change, then OnSaleBeforeStatusOrderChange , if after - then OnSaleStatusOrderChange

\Bitrix\Main\EventManager::getInstance()->addEventHandler('sale', 'OnSaleStatusOrderChange', ['Handler', 'OnSaleStatusOrderChange']);

class Handler {
  function OnSaleStatusOrderChange($event)
  {
    $parameters = $event->getParameters();
    if ($parameters['VALUE'] === 'F')
    {
      /** @var \Bitrix\Sale\Order $order */
      $order = $parameters['ENTITY'];
      /**
       *
       * Your code is here
       *
       */
    }

    return new \Bitrix\Main\EventResult(
      \Bitrix\Main\EventResult::SUCCESS
    );
  }
}