I need to search for an invoice on the VNPost Invoice Information Portal. What are the exact labels for the required fields on the 'Tìm kiếm hóa đơn' (Search invoice) form, and what kind of information is needed for each, especially for the authentication code?
Navigate to 'https://hoadon.vnpost.vn/' Locate the 'Tìm kiếm hóa đơn' (Search invoice) form. Identify the exact labels for all required input fields within this form. Determine the type of input required for each field. Specifically, ascertain the source or nature of the 'Mã xác thực' (Authentication code) input. Formulate an answer describing the labels, input types, and the mechanism for the authentication code.
State the exact Vietnamese label for the invoice lookup code field. State the exact Vietnamese label for the authentication code field. Confirm that both fields are required text inputs. Explain that the 'Mã xác thực' (Authentication code) is derived from a captcha image displayed on the page.