From the Admin Dashboard, click Administration and select Accounting.

You would add a refund in exactly the same way as creating an invoice. 

Enter details as per usual and then enter a negative quantity, either by clicking the down arrow or typing a minus sign (-) before the number. 

This will deduct the credit from your total.

Click + to add another line or x to delete. Click Save when you are done.

How do I mark an invoice as paid?
How do I amend a payment on an invoice?

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