/**
  * Get Shipping Price including or excluding tax
  *
  * @param \Magento\Quote\Model\Quote\Address\Rate $rateModel
  * @param bool $flag
  * @return float
  */
 private function getShippingPriceWithFlag($rateModel, $flag)
 {
     return $this->taxHelper->getShippingPrice($rateModel->getPrice(), $flag, $rateModel->getAddress(), $rateModel->getAddress()->getQuote()->getCustomerTaxClassId());
 }