I've been developing an app/website using an API account and I'm now ready to publish the app. Do I need to convert my account to a commercial / professional account? Please let me know of any fees associate with this. I've added the appropriate attribution lines as noted on your "Logos & Attribution" page. Also, Google App Store requires "written documentation proving that you have permission to use a 3rd party's intellectual property in your app or store listing (e.g. Brand names and logos, graphic assets, etc.)." Are you able to provide such documentation? I assume a simple email would suffice, but perhaps you've had experience providing this for the other apps listed on your "Third Party Apps" page.

Thank you, Marcus Rogers