A FedEx Meter number is an identification number associated with your FedEx account that FedEx uses to calculate your negotiated rates.
You do not need to enter a meter number into ShipStation. Instead, ShipStation sends the addresses entered into ShipStation's FedEx Connection window when you click Connect, and this registers a meter number in your FedEx account. ShipStation then stores the meter number and uses it when getting rates for your FedEx shipments.
FedEx Meter Error When Adding FedEx Account
If the address you entered into ShipStation's FedEx connection window does not match the origin address FedEx has on file for your account, you may see the following alert:
"FedExMeterManager: Unable to register meter. Account ##### Shipping address provided does not match our records."
To fix this, enter your FedEx shipping origin address when adding your FedEx account to ShipStation.
Once your FedEx account connects to ShipStation successfully, you can create FedEx labels using any of the Ship From addresses you've configured in ShipStation.