Help in background notification

Hello everyone
I would be really grateful if anyone help me

Requirement:
I need that after button click
User get notification at ( hr : mm) at same day in a week

Like 5:00 pm every Monday

I read itoo background task extension topic but I can’t understand how to make some like this

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Use the alarmmanager extension

Taifun

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any free alternative method :face_holding_back_tears:

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