Document::showQrCodeAction

public function showQrCodeAction(\Bitrix\DocumentGenerator\Document $document): ?Response\File
{
	$provider = $document->getProvider();
	if (!$provider instanceof CrmEntityDataProvider)
	{
		$this->addError(new Error('Data provider not supports QR-codes'));
		return null;
	}

	$path = $provider->getPaymentQrCode();
	if (!$path)
	{
		$this->addError(new Error('No QR-code found for this document'));
		return null;
	}

	$file = new IO\File($path);
	return new Response\File($path, null, $file->getContentType());
}