错误提示：
Unable to process payment. Please contact the merchant as the shipping address provided by the merchant is invalid, and the merchant has requested that your order must be shipped to that address.
文件:
app/code/core/Mage/Paypal/Model/Api/Standard.php
第234行(Magento 1.4.2)：
$request['address_override'] = 1
修改为：
$request['address_override'] = 0
或者注释掉或者直接干掉即可.