Your account's security is a very high priority in QuickBooks, @Deano2.

 No, your customers will not see any of your bank information when sending an invoice. I have a short video clip to show to you how the e-invoicing works. 

On the other hand, to learn more on how to track your invoice status, you can read through this article: Track status of your invoices in QuickBooks Online for mobile.

Also, you can check these articles for more insights about keeping your account safe and secured:

• Recognize and report suspicious emails (Phishing)
• Protect your QuickBooks Payments account from suspicious activity

Let me know if you have other questions. I'm always here to help.