Magazine app

Hi everyone!
I publish a magazine that is available in both digital and physical formats. I’m looking for a way to get exclusive content as well as the digital version of my magazine into an app that readers can download to their devices and get notifications when a new issue is published. I’d also like for them to be able to read the digital issue directly within the app or order physical copies through the app.

Is there anything like that available on the envato sites for purchase? If not in a full package, what would you suggest to get this scenario realized?

Thanks in advance for any suggestions or help!