To refactor the messenger’s package name to your own package name,
1. You have to be on the Android part of your android studio
2. Right click on com.procrea8.
silebookMessenger -> Rename Package.
3. Then, type in your package name -> RefactorNote:
All package name in the code must be the same, most especially
1. the second package name in google service.json file
2. the java code package name.
3. the applicationId in your build.gradle or app file