Scenario

I have tried printing a FedEx label, and I am seeing an error returned:

Invalid paymentType

Solution 

This error is returned when the Shipping Charges Payment Type is set up incorrectly.

To fix this:

1. Go to Shipping > Integrations.
   
   
2. Find your FedEx shipping integration and click the Config button.
   
   
3. Find the Shipping Charges Payment Type setting.
4. Change the value from the Account to Sender and save the changes.
   

If the error message remains the same, contact Linnworks Technical Support for further help!