in-app purchase customers data

[paolo mazza]

Hi all,
I have a question about in-app purchase of Apple.I was told "Your
server doesn't have to keep track of who has purchased what because
Apple does that. "
Is it true?
In particular I need to receive from Apple  the email of my customers.
Apple will send to me the name and the email of the person who
purchased the content from my app?
Thanks a lot
Paolo Mazza