When your user downloads a pass and adds it to their Wallet, Apple will send a request to confirm that the pass has been registered.
The package will handle the incoming request, and store the registration in the mobile_pass_registrations table. This registration will be associated the MobilePass model that was used to generate the pass that was downloaded by the user.
Here's how you can update a saved pass.
use App\Models\MobilePass;
$mobilePass = $user->firstMobilePass();
TODO: add code to update the pass
When a pass gets updated, the package will send a request to Apple to update the pass on the user's device. Apple will then send a push notification to inform the user that the pass has been updated.