If you need to issue a partial refund for a paid invoice, you can do this by adding a credit that will be applied to the customer’s next invoice.
Steps to process a partial refund
Identify the paid invoice
Locate the invoice that requires a partial refund.
Add a negative custom charge
This creates a credit that will be applied to the customer’s next invoice.
Review the scheduled invoice
Once completed, the customer’s next invoice will automatically include the refund amount as a credit.