If a guest has shortened their stay but has paid in advance it is easy to give a refund by just adding a negative payment.
- Shorten the number of nights (note payment has already been made and the balance is '$0')

- The nights have been shortened to '2' and the balance is now showing -70 ($70 owing to the guest). Select Refund Owing.

- Select the payment method and select Confirm.

- You will see the balance is now '$0'.
