Yes it is available for Professional Edition.
Chcek below link:
Can you tell me if the limitations are still the same with the realese of v23
Some Overlays are that are not currently supported in the DPS Web View will appear with a “content not available message,” these Overlays include:
Pan/Zoom Overlays set to “Pan Only”
Support for Web Viewer direct entitlement (Enterprise only). When customers hit the paywall limit in Web Viewer, they can now sign in using their subscription account to continue viewing articles.
Web Viewer supports Internet Explorer 10/Windows 8.
You can also set up a paywall for free folios.
The Web Viewer supports all overlays except for panoramas and audio clips.
If you create a 1024x768 folio using PDF image format, the content is now uploaded to the Web Viewer server in PNG format.
For more information:
The error message is related to Facebook developer account.
It seems your Facebook developer account is not verified.
There are two ways to verify your account. First, you can verify your cell phone, which allows us to verify that a real person is in control of the account. The second way to verify your account is to add a credit card to your account.
Unfortunately, if you cannot verify with a cell phone or add a credit card, you may be unable to verify your account. All developers must be verified before they can create a new app.
Just verify your account , if not please contact Facebook developer support.