For FedEx and UPS, you are invoiced by the carrier using the account you have registered with them.
For Canada Post, your shipping transaction expenses are charged to either your Pitney Works account or your Canada Post account.
To sign up for a Pitney Works
account, see about Pitney Works
. Once you have a Pitney Works account, you can view and pay your Pitney Works bills by following the directions in the article about billing and payments
UPDATED: April 14, 2021