Which Apple Developer program Should I enroll to create Passbook passes I am reading this documentation:
https://developer.apple.com/library/ios/documentation/UserExperience/Conceptual/PassKit_PG/Chapters/YourFirst.html

In order to register a pass type identifier, I need to be an Apple developer.
My pass will be available on a web page (not an iOS app).

Which of the developer programs should I enroll to: iOS/Mac/Safari?
You need to enroll in the iOS developer program since Pass Type Identifiers are not available to Mac developers and no identifiers are available to Safari developers.