I have an error message when invoicing 'select at least one way to get paid'. I haven't seen this before despite invoicing regularly.

Same (intermittent) issue! If you use DD, check if your mandate list can be viewed - might be related.  

Hello everyone,

There's also a report we received from another user regarding the error you've mentioned. In order for you to be added as affected by the said issue, I highly recommend contacting our support team. Rest assured this will be reviewed by our product engineers. 

Here's how you can contact our Support team:

1. Click Help. Then, Contact Us.
2. Enter "talk to a human," then click Continue.
3. Choose to either Chat with us or Have us call you.

Let me add these resources to help you manage your transactions once your concern is already resolved:

Record invoice payments in QuickBooks Online

Record and make bank deposits in QuickBooks Online

If you have any questions or need further assistance about managing your transactions in QuickBooks Online, feel free to visit this page and add comments. I'm here to help. Have a great day!