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Error prompt:

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.

File:

app/code/core/Mage/Paypal/Model/Api/Standard.php

2344(Magento 1.4.2)

$request['address_override'] = 1

To be amended as follows:

$request['address_override'] = 0

Either annotate it or kill it directly