There is no information about receiving data indicating that the application was launched from PassBook. In fact, it seems that the application does not receive information about the savings book. Passbook skips apps with related App-Id`s. What you can do is check that if there is a pass you are looking for is in the library. You can read the documentation here: PassBook Documentation But keep in mind that the Passbook Development Guide states that your passbook pass must be application independent.
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