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Void or Refund a Payment in WHMCS
Refunds
This applies to most payments including captured/authorized credit card transactions that have already been settled in the nightly credit card batch processing.
Edit the invoice that was overcharged/overpaid
Add a line item documenting the refund using a negative dollar amount
Select the Refund tab to issue a refund
Void Unsettled Credit Card Transaction
This applies to captured/authorized credit card transactions that have not yet been settled in the nightly credit card batch processing.
Log in to the gateway/processor control panel
Void the transaction
Edit the WHMCS transaction
Delete the payment transaction at the bottom
Mark the invoice unpaid, if desired
Delete the WHMCS transaction, if desired