CCrmInvoiceRecurringRestProxy::innerGet

protected function innerGet($ID, &$errors)
{
	$recurringInstance = \Bitrix\Crm\Recurring\Entity\Invoice::getInstance();
	if (!$recurringInstance->isAllowedExpose())
	{
		$errors[] = 'Recurring is not allowed';
		return false;
	}

	$recurringDataRaw = $recurringInstance->getList([
		'filter' => ['ID' => (int)$ID],
		'limit' => 1
	]);

	$fields = $recurringDataRaw->fetch();

	$userPermissions = CCrmPerms::GetCurrentUserPermissions();
	if (empty($fields) || (int)$fields['INVOICE_ID'] <= 0)
	{
		$errors[] = 'Recurring invoice is not found';
		return false;
	}

	if(!CCrmInvoice::CheckReadPermission($fields['INVOICE_ID'], $userPermissions))
	{
		$errors[] = 'Access denied';
		return false;
	}

	$result = array_intersect_key($fields, $this->getFieldsInfo());
	$params = $fields['PARAMS'];
	$formParamsMapper = \Bitrix\Crm\Recurring\Entity\Invoice::getParameterMapper($params);
	$formParamsMapper->fillMap($params);
	$restParamsMapper = \Bitrix\Crm\Recurring\Entity\ParameterMapper\RestInvoice::getInstance();
	$restParamsMapper->convert($formParamsMapper);
	$result['PARAMS'] = $restParamsMapper->getFormattedMap();
	return $result;
}