To send the International Commercial Invoice electronically on its way, the following information should be set/taken into consideration:


FedEx does not use the 'PaperlessInv' special service for electronic trade documents. The special service for FedEx is called 'ETD'. 

UPS = 'PaperlessInv'
DHL = n/a
USPS = n/a

You can check the carrier's api documentation for more details.