我们已将以下问题发送给PayPal的技术支持，并且在2周后仍然没有消息。我希望这里有人可以帮助我们：）
我们目前正在努力让PayPal Express Checkout与Magento合作。
正在调用我们的送货回拨脚本。
如果脚本发回以下响应（仅限UPS选项），则所有内容均按预期在PayPal中运行：
L_SHIPPINGOPTIONISDEFAULT0=true&L_SHIPPINGOPTIONAMOUNT0=19.03&L_SHIPPINGOPTIONLABEL0=ups_11&L_SHIPPINGOPTIONNAME0=United+Parcel+Service+-+UPS+Standard&L_TAXAMT0=5.98&L_SHIPPINGOPTIONISDEFAULT1=false&L_SHIPPINGOPTIONAMOUNT1=23.42&L_SHIPPINGOPTIONLABEL1=ups_13&L_SHIPPINGOPTIONNAME1=United+Parcel+Service+-+UPS+Next+Day+Air+Saver&L_TAXAMT1=5.98&L_SHIPPINGOPTIONISDEFAULT2=false&L_SHIPPINGOPTIONAMOUNT2=28.07&L_SHIPPINGOPTIONLABEL2=ups_01&L_SHIPPINGOPTIONNAME2=United+Parcel+Service+-+UPS+Express&L_TAXAMT2=5.98&METHOD=CallbackResponse
但如果我们发送此回复（UPS和rpc for Canada Post）选项，PayPal会忽略我们的回复并且不显示送货方式：
L_SHIPPINGOPTIONISDEFAULT0=true&L_SHIPPINGOPTIONAMOUNT0=6.08&L_SHIPPINGOPTIONLABEL0=rcp_1020&L_SHIPPINGOPTIONNAME0=Canada+Post+-+Expedited&L_TAXAMT0=5.19&L_SHIPPINGOPTIONISDEFAULT1=false&L_SHIPPINGOPTIONAMOUNT1=14.74&L_SHIPPINGOPTIONLABEL1=rcp_1040&L_SHIPPINGOPTIONNAME1=Canada+Post+-+Priority&L_TAXAMT1=5.19&L_SHIPPINGOPTIONISDEFAULT2=false&L_SHIPPINGOPTIONAMOUNT2=19.33&L_SHIPPINGOPTIONLABEL2=ups_11&L_SHIPPINGOPTIONNAME2=United+Parcel+Service+-+UPS+Standard&L_TAXAMT2=5.19&L_SHIPPINGOPTIONISDEFAULT3=false&L_SHIPPINGOPTIONAMOUNT3=25.10&L_SHIPPINGOPTIONLABEL3=ups_13&L_SHIPPINGOPTIONNAME3=United+Parcel+Service+-+UPS+Next+Day+Air+Saver&L_TAXAMT3=5.19&L_SHIPPINGOPTIONISDEFAULT4=false&L_SHIPPINGOPTIONAMOUNT4=28.21&L_SHIPPINGOPTIONLABEL4=ups_01&L_SHIPPINGOPTIONNAME4=United+Parcel+Service+-+UPS+Express&L_TAXAMT4=5.19&METHOD=CallbackResponse
以下是正在发送的SetExpressCheckout选项：
[PAYMENTACTION] => Sale
[AMT] => 39.95
[CURRENCYCODE] => USD
[RETURNURL] => {domain url}/paypal/express/return/
[CANCELURL] => {domain url}/paypal/express/cancel/
[INVNUM] => 100000009
[SOLUTIONTYPE] => Sole
[GIROPAYCANCELURL] => {domain url}/paypal/express/cancel/
[GIROPAYSUCCESSURL] => {domain url}/checkout/onepage/success/
[BANKTXNPENDINGURL] => {domain url}/checkout/onepage/success/
[LOCALECODE] => en_US
[ITEMAMT] => 39.95
[TAXAMT] => 0.00
[SHIPPINGAMT] => 0.00
[L_NUMBER0] => ABCDEF
[L_NAME0] => ABCDEF Name
[L_QTY0] => 1
[L_AMT0] => 39.95
[CALLBACK] => {domain url}/paypal/express/shippingOptionsCallback/quote_id/309/
[CALLBACKTIMEOUT] => 6
[MAXAMT] => 1038.95
[L_SHIPPINGOPTIONISDEFAULT0] => true
[L_SHIPPINGOPTIONAMOUNT0] => 0.00
[L_SHIPPINGOPTIONLABEL0] => no_rate
[L_SHIPPINGOPTIONNAME0] => N/A
[L_TAXAMT0] =>
[METHOD] => SetExpressCheckout
[VERSION] => 72.0
[USER] => ****
[PWD] => ****
[SIGNATURE] => ****
[BUTTONSOURCE] => Varien_Cart_EC_CA
我们无法弄清楚为何PayPal拒绝我们的送货方式？
提前致谢，