Hi koos.marietjie, thanks for sharing your query here.

I believe that you might be asking about the display of the invoice instead of the statement as the statement in QBO doesn't display any banking details.

Here's how you can edit the footer or message to customers in your invoice..
1.) Click on the gear icon at the top right
2.) Select Custom Form Styles
3.) Click on Content and then click on the bottom portion of the preview on the right
4.) Here's where you can make the text entry such as your banking details for your customer.
Be sure to click on Done after you've make the changes to save them