Creation of a Unity plugin that will allow my Android game to run in the background

Hi
I have a sound board app on Google Play that I created using Unity. I have got some feedback from users and they have asked for the ability to have the app running in the background if they lock the device or background the app.

I have looking around and it looks as though you have to create an Java Plugin that communicates with Unity and Android OS to do this. I have a feeling this is outside of my coding abilities so I am looking for some help.

Ideally, I would like to put the ability to play in the audio when the app is backgrounded/locked behind a In App Purchase. Is this also possible?

Is this something you reckon you would be able to do?

Look forward from hearing from you.

Thanks,

Dan