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Obtaining your Firebase Server API Key
Firebase provides Server API Key to identify your firebase app. To obtain your Server API Key, go to firebase console, select the project and go to settings, select Cloud Messaging tab and copy your Server key.
Where I have to put my API Key?
for security needed, Update API_KEY String value.
Open Android Studio Project.
Click CHANGE API KEY to generate new API Key.
go to app > java > yourpackage name > Config.java, and update with your own API Key.
Where do I get my OneSignal APP ID and Rest API Key?
Login to your OneSignal Account and select your app