Yes! Just show your I.D. but you must have the black card membership.
If you're a black card member, yes.
Yes, download the app to use. Much easier.
Does your membership allow you to access multiple branches? As for the PF card, they need to scan something is u want to enter. Sometimes I use the app which displays the a (card) as in barcode, plus, if i don't have my card with me, they usually print me one instantly and then scan it. I don't remember clearly but they asked for my mobile number / email. Can't recall if they asked for my ID.
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