Due to several security and accounting restrictions enforced by FedEx APIs as well as commerce laws, we do NOT allow the use of third party shipping account numbers through our fulfillment system.
You can get around this by placing a "customer pickup" order.
Once you get the automated email from our fulfillment system indicating your order number and details etc., please submit a ticket request with order number, "ship to" address with full contact info and the FedEx or UPS account number.
Please note that there is a processing fee to handle third party account fee. Please contact sales.