Orientation about receiving a couple of pieces of data from an external service

Basically my app will be in the background (or maybe even closed) and then fire certain screen when a remote camera reads a number, and sends it to the app along with an ID. In other words how do I make my app “listen” for a particular push of data?

Which is the way to go, restful apis?
Should I use OneSignal for this?

Any Tutorial out there related?

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Hey @parknpayuserc4he

This isn’t possible with Thunkable. The app needs to be open and running in the foreground.

Can you tell us a little more about the app you are trying to build?