Overview
Starting in Version 8.004, users can disable the printing of Commercial invoices, also called customs documentation, on a carrier-specific basis. This will only apply to USPS, FedEx, and UPS.
All carriers will be set to print commercial invoices by default when needed for international shipments. To disable it, you must set a system parameter for each carrier to false.
System Parameters
USPSPrintInvoice – Set to True to print Commercial invoices for USPS shipments
UPSPrintInvoice – Set to True to print Commercial invoices for UPS shipments
FedExPrintInvoice – Set to True to print Commercial invoices for FedEx shipments