Payone Core

1. Open app/code/local/TM/FireCheckout/etc/config.xmland find the following line:

   <quote_address>TM_FireCheckout_Model_Quote_Address</quote_address> <!-- Fix for paypal express. Call for validate method overriden -->
   

   replace it with:

   <!-- <quote_address>TM_FireCheckout_Model_Quote_Address</quote_address> --> <!-- Fix for paypal express. Call for validate method overriden -->
   

2. Open app/code/community/Payone/Core/Model/Sales/Quote/Address.php and replace the following line:

   class Payone_Core_Model_Sales_Quote_Address extends Mage_Sales_Model_Quote_Address
   

   with:

   class Payone_Core_Model_Sales_Quote_Address extends //Mage_Sales_Model_Quote_Address
       TM_FireCheckout_Model_Quote_Address