What is the package name of App build using AppInventor how to know the package name

to use firebase in my app developed usign AppInventor. to use firebase the initial inputs required includes package name. how to know the package name of my app.
help will be appreciated please

appinventor.ai_email.appName

Example:

grafik

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firebase not accepting this version

thanx
got it

What does that mean?

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is it possible to change package name like this?
how did you access that?

Taifun