magento2:运营商/ shipping_code（默认/运营商/ shipping_code /类型）下的类型含义是什么？

是的，你是对的，它只用于确定请求的类型：

获取报价：

protected function _getQuotes()
{
    switch ($this->getConfigData('type')) {
        case 'UPS':
            return $this->_getCgiQuotes();
        case 'UPS_XML':
            return $this->_getXmlQuotes();
        default:
            break;
    }
    return null;
}

要获得跟踪：

public function getTracking($trackings)
{
    if (!is_array($trackings)) {
        $trackings = [$trackings];
    }
    if ($this->getConfigData('type') == 'UPS') {
        $this->_getCgiTracking($trackings);
    } elseif ($this->getConfigData('type') == 'UPS_XML') {
        $this->setXMLAccessRequest();
        $this->_getXmlTracking($trackings);
    }
    return $this->_result;
}

并获得允许的方法：

public function getAllowedMethods()
{
    $allowed = explode(',', $this->getConfigData('allowed_methods'));
    $arr = [];
    $isByCode = $this->getConfigData('type') == 'UPS_XML';
    foreach ($allowed as $code) {
        $arr[$code] = $isByCode ? $this->getShipmentByCode($code) : $this->configHelper->getCode('method', $code);
    }
    return $arr;
}