Hi Moclips,
The online payment popup will usually show on new accounts. Eventually, it'll stop if you keep on selecting Quit or if you close it. If your QuickBooks isn't new, please submit feedback to our engineers about it. You can click on the Gear icon and choose Feedback. I'll also do the same thing here on my end. It's the best thing to do right now while we're unable to disable it.
Please join us back here if you have additional questions.