There are two types of refunds that can be done in a project, full, partial, and a credit for an amount invoiced but not yet paid.
For a full or partial refund on a fully paid project:
1.) Add a minus line item to reflect the Credit/Refund amount.
2.) Create an Invoice with the type set to Credit and enter minus the refund amount.
3.) Create a Payment and enter minus the refund amount and enter REFUND in the reference field.
To give a customer a Credit for an amount that has not been paid:
1.) Add a minus line item for the Credit amount the customer is not going to pay.
2.) Create an Invoice with the type set to Credit and enter minus the Credit amount.
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