Push notification when close app

Hello everyone, I am a newbie. I’ve joined my friend’s team to create an app. We don’t know how to create a push notifi when close app (not close app is ok, just it can send notifi). Can anyone help me?
Clearly that I want to create code…ah…example in particular when u come to berlin, u r already in berlin. App sends a notification: Welcome to Berlin.
help me!
I would send money for u
(Tell me detail guide pls)
Thank you!

(one thing that is it necessary to use OneSignal or Firebase?)

You can use Firebase Cloud Messaging instead of OneSignal.
Look for the extensions in Taifun's extension directory.

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Already asked in Kodular and received an answer there

PS: thread closed

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