您可能知道，Magento 中有 FedEx Web Services API。但我仍然无法让它工作。在 Magento 的管理端输入所有（密码、帐户 ID、密钥等）。仍然得到
此送货方式目前不可用。如果您想使用这种运输方式发货，请联系我们。
试图捕捉在code/core/Mage/Usa/Model/Shipping/Carrier/Fedex.php中发生的事情 发送 SOAP 请求时，行 ~360：
$requestString = serialize($ratesRequest);
$response = $this->_getCachedQuotes($requestString);
抓到$requestString和$response。
$response始终为空（print_r 给出空字符串），还尝试在管理端设置是和否的“沙盒模式”。是$requestString：
a:4:{s:23:"WebAuthenticationDetail";a:1:{s:14:"UserCredential";a:2:{s:3:"Key";s:16:" KEY ";s:8 :"Password";s:6:" PASSWD ";}}s:12:"ClientDetail";a:2:{s:13:"AccountNumber";s:9:" ACCNUMBER ";s:11:"MeterNumber ";s:9:"米数";}s:7:"版本";a:4:{s:9:"ServiceId";s:3:"crs";s:5:"主要";s:1:"9";s: 12:"中级";s:1:"0";s:5:"次要";s:1:"0";}s:17:"RequestedShipment";a:11:{s:11:"DropoffType ";s:14:"REGULAR_PICKUP";s:13:"ShipTimestamp";s:25:"2011-12-08T20:33:05+00:00";s:13:"PackagingType";s:14: "YOUR_PACKAGING";s:17:"TotalInsuredValue";a:2:{s:7:"Ammount";d:129.06999999999999317878973670303821563720703125;s:8:"货币";s:3:"USD";}s:7: "发货人";a:1:{s:7:"地址";a:2:{s:10:"邮政编码";s:5:"07094";s:11:"国家代码";s:2: "美国";}}s:9:"收件人";a:1:{s:7:"地址";a:3:{s:10:"邮政编码";s:5:"10033";s:11:"CountryCode";s:2:"US";s:11:"住宅";b:1;}}s:22:"ShippingChargesPayment";a:2:{s :11:"PaymentType";s:6:"SENDER";s:5:"Payor";a:2:{s:13:"AccountNumber";s:9:"368675440";s:11:"CountryCode ";s:2:"US";}}s:16:"RateRequestTypes";s:4:"LIST";s:12:"PackageCount";s:1:"1";s:13:"PackageDetail ";s:19:"INDIVIDUAL_PACKAGES";s:25:"RequestedPackageLineItems";a:1:{i:0;a:1:{s:6:"重量";a:2:{s:5:"值";d:145.3600000000000136424205265939235687255859375;s:5:"单位";s:2:"LB";}}}}}11:"PaymentType";s:6:"SENDER";s:5:"Payor";a:2:{s:13:"AccountNumber";s:9:"368675440";s:11:"CountryCode" ;s:2:"US";}}s:16:"RateRequestTypes";s:4:"LIST";s:12:"PackageCount";s:1:"1";s:13:"PackageDetail" ;s:19:"INDIVIDUAL_PACKAGES";s:25:"RequestedPackageLineItems";a:1:{i:0;a:1:{s:6:"重量";a:2:{s:5:"价值";d:145.3600000000000136424205265939235687255859375;s:5:"单位";s:2:"LB";}}}}}11:"PaymentType";s:6:"SENDER";s:5:"Payor";a:2:{s:13:"AccountNumber";s:9:"368675440";s:11:"CountryCode" ;s:2:"US";}}s:16:"RateRequestTypes";s:4:"LIST";s:12:"PackageCount";s:1:"1";s:13:"PackageDetail" ;s:19:"INDIVIDUAL_PACKAGES";s:25:"RequestedPackageLineItems";a:1:{i:0;a:1:{s:6:"重量";a:2:{s:5:"价值";d:145.3600000000000136424205265939235687255859375;s:5:"单位";s:2:"LB";}}}}}PackageDetail";s:19:"INDIVIDUAL_PACKAGES";s:25:"RequestedPackageLineItems";a:1:{i:0;a:1:{s:6:"Weight";a:2:{s:5: "值";d:145.3600000000000136424205265939235687255859375;s:5:"单位";s:2:"LB";}}}}}PackageDetail";s:19:"INDIVIDUAL_PACKAGES";s:25:"RequestedPackageLineItems";a:1:{i:0;a:1:{s:6:"Weight";a:2:{s:5: "值";d:145.3600000000000136424205265939235687255859375;s:5:"单位";s:2:"LB";}}}}}
（替换了实际密码、密钥等，不希望它们公开）。
各位，怎么回事？如何解决这个问题？我召唤 Magento 1.6 FedEx 专家！我想我不是唯一一个有这种问题的人！