You can only cancel an invoice whose status is NEW.
Step 1. Click on the invoice you want to cancel on the Invoices page.
Step 2. On the invoice detail page, click Void invoice
Step 3. In the confirmation popup, input your memo (optional) and click Void invoice
And by that you have successfully canceled the invoice.
Its status will change from NEW to CANCELED. The payment link will become expired and your customer will not be able to pay through it anymore.
If you want to check the notes you have entered, you can see it in the invoice detail page.
