NSItemProvider with an identifier like "com.apple.pkpass"

I am creating an iOS extension and would like to accept Passbook pass. I have a distribution extension working in this:

NSItemProvider *itemProvider = inputItem.attachments.firstObject;
[itemProvider hasItemConformingToTypeIdentifier:@"com.apple.pkpass"];

      

        
        
        
      

    

returns true. However, I am getting lost while trying to load this item. I tried to apply it to NSData using this and other types:

[itemProvider loadItemForTypeIdentifier:@"com.apple.pkpass" options:nil completionHandler:^(NSdata *item, NSError *error) {
    NSLog(@"%@", item);
}];

      

        
        
        
      

    

However, nothing works. Does anyone know how to use Passbook pass in a share extension? I prefer NSData object.