question about patapon 2's download only thing

[Blu boy]

so many of u have heard about patapon2 being download only. so if u buy it at retail u just get a code to download it. but to enter the code dont u have to be on the ps store or in the account management area. that would mean if u dont have your psp hooked up online, which many psps r that way, and u buy patapon 2 at a retail u cant play it. that sounds like a huge problem. am i correct on my assumption or am i missing something. thanks