Here you can set whether the shipment charges will be billed to your account (the default), or billed to another account:
A third party account (aka Third Party billing)
The recipient's account (aka Freight Collect)
When Shipping via FedEx Ground®, there are two options for billing 'collect:'
Recipient Account
Collect
Recipient Account requires the recipient's FedEx account, and will bill charges to this account.
Collect allows a recipient FedEx account to be entered. If an account is provided, charges are billed to the account. If an account is not provided, the delivery driver will collect the shipping charges by cash or check from the recipient at the time of delivery.