If you create your invoices today using the online invoicing software from FactuurSturen.be, you can easily receive all these invoices in OkiOki as well.
Go to 'Settings (1)' and then click on 'Stationery profiles (2)'.
Then go to 'Send a copy of outgoing emails (BCC)' and add your OkiOki email address (3).
That's it. Easy, right?