A credit note cancels out an invoice you've already issued, in full or in part. You create one by duplicating the original invoice and making the amounts negative.
Create the credit note
Go to Invoices
Select the invoice you want to credit
Swipe up on the lower menu and tap Duplicate
A new invoice appears with all the details from the original
Make the amounts negative
Tap an item and add a minus sign (-) in front of the price
Tap Save
Repeat for every item on the document
Tap Done
Tip: to credit part of an invoice rather than all of it, only make negative the items you're crediting. Delete the rest.
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