Hi there, @Skywire1.

We don't recommend any apps for convenience fees for desktop users. Although, we can route you to the page to find a QuickBooks-integrated app that supports this feature. 

Please check out this link to search for the app: https://desktop.apps.com/home

If you need related resources while working with QuickBooks, please feel free to skim through the topics from our help articles.

Please let me know how else I can help you with QuickBooks. I've got your back and am always happy to help. Keep safe!