As far as I know, intents are “broadcasted” by the original app, so if you want to make use of them, the original app must always be active, too.

But please be aware that intents aren’t currently working properly, so I guess that this part of the app will need a revamp some day, which will also change the access interface conditions.

Therefore, the probably better way for you may be to study the original app’s code (it’s open source), and then integrate whatever you need in your own standalone app.