In this lin, I was told to use the APPiD and the Unique ID of the app. Where can I find these informations? In AEM?
Welcome to the Analytics Community. It would be great if you can introduce yourself here.
If appid is missing you can try enabling Mobile App Acquisition and then re-download the SDK configuration file.
There is a java tool (acquisitionTest.jar) to help you get the unique ID and broadcast install referrer to help you obtain the information. Download acquistionTester.zip, then extract the .jar file.
I hope that helps.