IOSS numbers are currently collected from some platforms, as more are added, we will list them here.
For supported carriers other than Click & Drop, there is nothing else to do. Packing Partner supplies the IOSS number to the carrier, which is all that is required.
Click & Drop
See below for Click & Drop as this requires additional setup on your Click & Drop account.
Currently supported platforms
Channel Advisor - See here for getting IOSS details
CSV Import - See here for Import CSV details
Currently support carriers
Click & Drop - See here for setting up Trading Names for IOSS, see here for mapping fields .
Hermes Corporate - IOSS number is uploaded on creating carrier labels