Anytime a customer opens REVIEW AND PAY they see "CONTACT .....IF YOU ARE UNSURE HOW TO PAY THIS BILL" Why cant you just show our business bank account details .

Thanks for taking the time to reach out to us here, userhobartcrest.

Your customer will get this message if there a problem with the account that is linked to your payments. 

To remotely check your settings and reset the link for the Review and Pay button, I recommend reaching out to our Merchant Service Team.

You can get the contact information here: Contact Payments Support.

I'm just a post away if you have other concerns with QuickBooks Online.