You can add passes to Passbook in several ways, such as:
Passbook-enabled apps: When you buy tickets, check in for a flight, or add a card via an iOS app, the app will offer or prompt you to add a pass to Passbook. To view a list of featured Passbook-enabled apps on your device or in iTunes, click or tap this link: http://itunes.com/passbookapps Mail or Messages: Passes can be sent as attachments or links via email or Messages, and you can add them to Passbook by tapping or clicking on them. Example: An email confirming your flight could include your boarding pass as a Passbook-enabled attachment. Web browser: Websites or web mail can also include passes as attachments or links. You can click or tap these links to add them to Passbook.
Passbook is time- and location-based, so your passes automatically appear on your Lock screen when and where you need them. For example, when you arrive at the airport your boarding pass should appear. Slide to unlock your device to display and scan the pass.