Multi-tier online art marketplace architecture orchestrates customer, artist, and admin interactions through a layered API Gateway pattern. Backend services handle JWT authentication with RBAC, art inventory management with smart recommendations, shopping cart state management with PDF invoice generation, and an interior visualizer for AR-style artwork placement previews. The system integrates external payment gateways, cloud storage for artwork images, and notification services (email, SMS, push) while maintaining transactional consistency across users, orders, wishlists, reviews, and shipment tracking in a central relational database. Fork this diagram on Diagrams.so to customize the authentication flow, swap payment providers, or add real-time inventory sync for your marketplace. Ideal for teams architecting multi-role platforms where artists upload content, customers browse and purchase, and admins manage catalog and fulfillment workflows.