In order to issue a credit note, you need to cancel the invoice it relates to.
Follow these steps in order to do so:
- Open the Countingup app
- Tap 'Accounting'
- Tap 'Sales invoices'
- Find the unpaid invoice you wish to cancel and issue a credit note for
- Tap 'Cancel' and confirm the action
- Tap 'Send' in order to issue the credit note
You can also send a copy of the credit note to yourself by checking the box before tapping 'Send'