Re-send and credit
To resend an invoice and credit the previously sent one, go to Invoice - History, find the invoice, and click on the envelope icon to resend it.
This will take you to the invoice creation window where you can make any needed adjustments before sending it again. Once you hit send, both the new invoice and credit note will be automatically sent to the customer.
The new invoice and credit note can be found in the Invoice - History section.
Invoices that have already been credited will be marked with a red envelope icon next to their invoice number.