apple store and authorized users

if I buy the iPhone at the apple store, and I am an authorized user (I'm not the account holder), will I have any issues? This is assuming that the ATT store is sold out, because I will try there first.

 

i was reading that all that the apple store reps are going to do is point you to an imac, and you need to register it. Maybe the apple reps won't technically be touching the accounts. when i called att, they stated that as long as i was an authorized user, all i needed was an id and the last four of the account holder's ssn. hopefully, someone else will chime in with more concrete info.