QuickBooks Shipping Manager only supports domestic shipping.
Regardless of the shipping service (FedEX, UPS, or USPS/Stamps.com), the amount of documentation required when shipping internationally changes based on the location you are shipping to.
Because of the wide varience in documentation requirements, Quickbooks Desktop does not support the forms or information required to ship internationally.
For Documents, duties, and Taxes for international shipping please visit the FedEx Web site, the UPS site, or Stamps.com as appropriate for the shipping method you wish to use.
There are Third Party Programs that work with QuickBooks, such as Ship Rush (used for FedEx Shipments).