GoAffPro provides you with the option to automatically create invoices for affiliate payments.
To automatically create invoices for affiliate payments, go to the Extras section in the Settings tab of the GoAffPro admin panel.
Here, go to the Invoices section.
Now, enable the toggle.
After this, you can also make edits to the invoice template by clicking on Edit Invoice Template.
The invoices for the affiliate payments can be downloaded by clicking on the Download Invoice in the Payment History section of the Payouts tab.
The default invoice template will look like this.