tl;dr: Apple has released Pass Designer, a macOS tool for creating and previewing Apple Wallet passes with real-time rendering that matches iOS and watchOS output. It supports templates, color/layout customization, standard field editing, validation, and semantic tags (for boarding passes and tickets) that enable Siri Suggestions, Calendar, and Maps integration, with automatic backward-compatible pass generation. The beta requires macOS 27 or later and an Apple Developer account.