16. Infrastructure & Stack

Runtime and platform

• Cloudflare Workers / Pages for backend and edge services.
• KV for fast session and blacklist state.
• R2 for larger exportable storage or card audit logs.
• SQLite or Cloudflare D1 for transaction reconciliation.

App stack

• Frontend: React / TypeScript / Web NFC / Web Crypto.
• Backends: edge workers with zero-trust APIs.
• Local cache for offline terminal validation.

Deployment model

• Multi-tenant environment with shared backend services.
• Separate station/gate/terminal client builds for role-specific behavior.
• Global edge distribution for low-latency validation.