539067 PayPal express Checkout integration with MVS

‘'Paypal Express bypasses part of the osCommerce checkout process. The osCommerce checkout process is modified by MVS to make MVS work. Paypal's code needs to be modifed as well ‘'. Scenario: PayPal express Checkout takes the shipping amount setting in the ZONE 2 regardless of the shipping address . So using PayPal express checkout for shipping items within Switzerland, shipping gets charged from the setting in the zone 2 although Switzerland(CH) is in the ZONE 1 Please tell me how much would it cost to fix the PayPal experess checkout code.