Each channel varies on the carrier name that they accept. Below is a list of preferred shipping carrier names that you can provide when creating a shipment in Sellbrite. If an unknown carrier name is provided, e.g. "Joe's Trucking Service", Sellbrite will follow the channel specific rules for sending tracking numbers and attempt to cast this to the correct default "Other" type if required.

USPS
UPS
FedEx
Australia Post
Canada Post
Deutsche Post
DHL eCommerce
DHL Express
Lasership
OnTrac
Royal Mail
Other