In the Orders section, under Customer Info, you can upload the order invoice. This document appears in the refurbed customer account area, where customers can download it directly.
After uploading the invoice, you can delete and re-upload it if needed.
The same functionality is also available through our Seller Order API (see here: 🧾 Invoices (SetOrderInvoiceStream / GetOrderInvoice / DeleteOrderInvoice) ).