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Microservices E-Commerce Platform — Architecture

Example architecture input for a microservices-based e-commerce platform. This diagram demonstrates a traditional distributed system with synchronous REST calls between services, asynchronous event-driven communication via a message queue, and clear trust boundary separation across four zones.

format: mermaid

flowchart TD
    Client[Client Application]

    subgraph External Clients
        Client
    end

    subgraph DMZ
        Gateway[API Gateway]
        Registry[Service Registry]
    end

    subgraph Internal Services
        OrderSvc[Order Service]
        PaymentSvc[Payment Service]
        NotifSvc[Notification Service]
        MQ[(Message Queue)]
        OrderDB[(Order Database)]
        InventoryDB[(Inventory Database)]
    end

    subgraph External Services
        PaymentProvider[External Payment Provider]
    end

    Client -->|HTTPS Request| Gateway
    Gateway -->|Service Lookup| Registry
    Registry -->|Endpoint List| Gateway
    Gateway -->|REST / Route Request| OrderSvc
    Gateway -->|REST / Route Request| PaymentSvc

    OrderSvc -->|Read/Write Orders| OrderDB
    OrderSvc -->|Check Stock / Reserve Items| InventoryDB
    OrderSvc -->|Publish OrderCreated Event| MQ
    OrderSvc -->|REST / Payment Request| PaymentSvc

    PaymentSvc -->|HTTPS / Charge Request| PaymentProvider
    PaymentProvider -->|Payment Result| PaymentSvc
    PaymentSvc -->|Publish PaymentCompleted Event| MQ

    MQ -->|OrderCreated Event| NotifSvc
    MQ -->|PaymentCompleted Event| NotifSvc
    NotifSvc -->|Send Email / SMS| Client
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Component Summary

Component DFD Element Type Notes
Client Application External Entity End-user browser or mobile app; untrusted zone
API Gateway Process Single entry point; routes requests, enforces auth; DMZ zone
Service Registry Process Maintains service endpoint catalog for dynamic discovery; DMZ zone
Order Service Process Handles order creation, validation, and lifecycle; trusted zone
Payment Service Process Orchestrates payment flow with external provider; trusted zone
Notification Service Process Consumes async events and delivers user notifications; trusted zone
Message Queue Data Store Async event bus for decoupled service-to-service communication; trusted zone
Order Database Data Store Persistent storage for order records and state; trusted zone
Inventory Database Data Store Persistent storage for product stock levels; trusted zone
External Payment Provider External Entity Third-party payment processor (e.g., Stripe); untrusted zone