How do I change a paid invoice to unpaid?

Hi Serated788. In order to have the invoice show as unpaid, the payment that was received needs to be deleted.

What I would do, is search for the transaction amount using the search function at the top. Once you search for the payment follow these steps:

1. Click on the payment in the search window
2. Now, the payment will open in another window
3. At the bottom of the screen, select Delete 
4. Select Yes

Now the payment has been deleted, and the invoice will no longer appear as paid.If you have any more questions, just reply here.