Developer Program for Viewing Passbook-Related Pages I have a registered Apple Developer account. However, I cannot view the following pages:


iOS Provisioning Portal
https://developer.apple.com/library/prerelease/ios/documentation/UserExperience/Reference/PassKit_Bundle/Chapters/Introduction.html
https://developer.apple.com/downloads/index.action?name=Passbook


Do I need to join the iOS Developer Program ($99/year) just to view those documentations?
Yes - those links are pre-release and protected to iOS registered developers. You might get by with an educational account - but most developers use the $99/year plan to gain access to the Provisioning Portal.

Provisioning devices for testing your application on real iPhones rather than the simulator does require a membership, as does any pre-release software or documentation. However, Passbook is not pre-release documentation any more; with the release of iOS 6, they have published public documentation, so you can view this. If you need more information as to what the $99/year membership gives you access to, view their iOS Developer Program page.