Hells_Fury
Discoverer
Yes, it is mandatory.Another question - while downloading free books from play store its asking to register debit / credit card. Is it mandatory ? Even to have free books ?
It just asks for confirmation in a popup, no PIN required. Its very easy to buy something by mistake.So even if I give real details, while buying any book or app, does amount is debited directly or needs to enter PIN or something.