12 classes are annotated with UbercartOrderPane in Ubercart 8.4

AdminComments in uc_order/src/Plugin/Ubercart/OrderPane/AdminComments.php

View the admin comments, used for administrative notes and instructions.

BillTo in uc_order/src/Plugin/Ubercart/OrderPane/BillTo.php

Manage the order's billing address and contact information..

CustomerInfo in uc_order/src/Plugin/Ubercart/OrderPane/CustomerInfo.php

Manage the information for the customer's user account.

LineItems in uc_order/src/Plugin/Ubercart/OrderPane/LineItems.php

View and modify an order's line items.

OrderComments in uc_order/src/Plugin/Ubercart/OrderPane/OrderComments.php

View the order comments, used for communicating with customers.

Payment in payment/uc_payment/src/Plugin/Ubercart/OrderPane/Payment.php

Specify and collect payment for an order.

PrintButton in uc_order/src/Plugin/Ubercart/OrderPane/PrintButton.php

Button to open a printable invoice.

Products in uc_order/src/Plugin/Ubercart/OrderPane/Products.php

Manage the products an order contains.

Quotes in shipping/uc_quote/src/Plugin/Ubercart/OrderPane/Quotes.php

Get a shipping quote for the order from a quoting module.

ShipTo in uc_order/src/Plugin/Ubercart/OrderPane/ShipTo.php

Manage the order's shipping address and contact information.

Tracking in shipping/uc_fulfillment/src/Plugin/Ubercart/OrderPane/Tracking.php

Display tracking numbers of shipped packages.

UpdateOrder in uc_order/src/Plugin/Ubercart/OrderPane/UpdateOrder.php

Update an order's status or add comments to an order.