WC_Shipping_Method::get_fee PHP Method

    public function get_fee($fee, $total)
    {
        if (strstr($fee, '%')) {
            $fee = $total / 100 * str_replace('%', '', $fee);
        }
        if (!empty($this->minimum_fee) && $this->minimum_fee > $fee) {
            $fee = $this->minimum_fee;
        }
        return $fee;
    }