How to add a payment manually to an invoice?

Admin users are able to add payment to due invoices with a negative balance.

Step 1: Go to Invoices > Select $ Add payment

Step 2: Complete amount, date and don´t forget to add a reminder reference for the manual payment.

Step 3: You are done. The invoice is now paid and the balance is €0.

Note: A transaction has been generated with the amount selected on step 2.