How to do refund (New Version)

If want to refund payment to your customer or get refund from supplier, please go back to the invoice -> view -> payment received page -> add payment.
Put - figure (refund amount)-> payment method (refund from which bank) -> save
The invoice will becomes outstanding, so that can use the CN to knock off the outstanding amount.
How to apply Credit note in invoice, please refer below the solution link.
Apply a credit note to an invoice (New version)