Android Question How to return qr scan result to a another app

Hello everyone. Today I come to you with a great concern, I try to create a qr code reader app, where another app can call it and my app returns the scanned value. I was able to see that the attempts exist, but I cannot find a tutorial where it is well understood how I can make my app run from another and once I scan the code, return the scanned value to the same app.
 
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