You can now attach your banking details - or any other extra info - to your invoices.
How does it work? It is a default setting, that you can set in your Settings section (menu link is in the top right). In your Settings, you'll find a link to Default Invoice Notes. Here you can save your banking details.
Now, whenever you create a new invoice, these default invoice notes appear on your invoices.
For any of your existing invoices, however, you will need to add your banking details separately for each invoice on its Edit screen.
Enjoy.