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the unique identifier plu or _id

I came through previous questions and found something interested

1 - in this one, Here your answer means that [plu] is the unique identifier but as example category array contain product & subproduct array contain [_id] !!
what to do, I need to use plu as you said but it's not exist in testing data !!!

2-Can i use [_id] as unique identifier or its outdated ?

Thank you...