Hi @Shikker! Thank you for reaching out and being a part of the community! I’m sorry it’s taken so long for us to get you a response.
You are correct that the only fields you can update through the built-in Quickbooks Online node are those you specified. That said, you could look to use the HTTP Request node to update the invoice for fields we don’t currently support.
You could still use the credentials you’ve configured for the app, and you would just have to specify the correct endpoint in the request. You can reference Intuit’s API documentation for QBO for the correct addresses and required parameters.
I hope this will help you move ahead in the right direction!