To enable this feature in your Google Checkout merchant account, go to the Settings tab, select 'Integration', and expand the 'Advanced settings' section. Then, check the box next to 'Notifications must include information about transaction fees' and then click the Save button. You will then begin receiving information about transaction fees for your orders in any charge-amount-notification, refund-amount-notification, and chargeback-amount-notification messages that are sent to your notification handler.
Please post any questions or feedback you have about this new feature in our Merchant Forum.
Posted by Jan Kleinert, Developer Relations