I am also looking for a way to disable this popup.  Any help would be appreciated.

Does the payment go thru if you can get thru the pop-up? I'm unable to.

I came here looking to disable the pop-up.  I have it appearing for each invoice I am trying to re-send with a message about late payment (15). It has really slowed down my day.

Hello everyone,

We are currently experiencing an issue where customers are encountering the 5xx errors or Level 3 Data popup when processing payments using QuickBooks Desktop.

Our engineers are working to fix this as soon as possible.

In the meantime, please visit this link for updates about the issue: https://status.quickbooks.intuit.com/.

We appreciate your patience while we're working on a resolution. If you have any further questions, please don't hesitate to reach out to us.