A merchant is trying to improve the customer experience for register customer and needs to...

Tracking numbers can be entered during invoice creation and they will only be visible after the order paid.

Tracking numbers have to be entered during shipping creation and they will be accessible in the Orders section in My Account immediately.

Tracking numbers are only supported for UPS, USPS and FedEX carries out-of-the box for other carries it will require it customization.

Tracking numbers can only be added to order comments via the admin