What’s an applicationID? How does it differ from the package name?

Q: When setting up push notifications in the Developer Console under Application Identifier, what’s the Application ID?

A: The Application ID is your app’s unique identifier, typically set in the build.gradle file, as shown below:

Q: Is the Application ID the same as the package name?

A: If not configured in build.gradle, the Application ID defaults to the package name. If configured as shown above, the Application ID can differ from the package name.