After both the PV and WHT certificate have been completed, you will be able to make a payment by clicking the “Make Payment” button on the prepare WHT certificate screen. The confirmation pop-up will appear and ask for confirmation.
Click “Yes” if you wish to confirm. You will be redirected to the Document screen. You will see the message “Payment is successfully updated to Xero.” on the top of the screen. To see if this is done correctly, you can check on the invoice that you just made a payment on. That invoice should be moved and placed into the “Paid” screen in Xero with 2 payments attached.