Registering a Device to Receive Push Notifications
Wallet app fully implements Apple's protocol to register a pass with service provider so push messages can be sent to the pass. All protocol commands, data types and options are supported as described in APPLE WALLET WEB SERVICE REFERENCE
To assist you as a Service Provider in identifying a pass installed in the Wallet app and allowing push messages to be routed accordingly, the Wallet app replaces the original string ApplePass
. This is the only change from the original Apple specification. So if your service already support Apple's protocol, you can easily implement support for the Wallet app.