code: public function get(TaxGroupInterface $taxGroup, CountryInterface $country, $business = false)
      {
          $key = $this->buildKey($taxGroup, $country, $business);
  
          if (isset($this->taxes[$key])) {
              return $this->taxes[$key];
          }
  
          return null;
      }
docs: Returns the taxes for the given tax group, country and business flag.
  
  @param TaxGroupInterface $taxGroup
  @param CountryInterface  $country
  @param bool              $business
  
  @return TaxInterface[]|null