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Select each new client you added and give them access to "DPD NL, TNT NL, DPD, Hermes, Interpost, Omni Parcel, Royal Mail"
System Admin -> Settings -> API Credentials
Note down the API Key then log into Supplystream to continue the set up
SUPPLY STREAM SET UP
Logged as Admin
Admin -> Mappings -> Clients
Click the plus icon then Add new client then click save and close
Admin -> Carriers -> Carrier Company Access
Make sure new client has access to the carrier that has been linked or set up in the TMS
To Add the Interface Type Settings
Admin -> Carrier Providers -> Provider Interface Settings
Run the bellow script