Shopify Order Fulfillment Automation Demo

🎯 Project Overview

Enterprise-grade demonstration of Shopify webhook automation showcasing professional software architecture, design patterns, and scalable order fulfillment processing.

Key Features:

• ✅ Event-driven webhook architecture with unified endpoint
• ✅ Multiple design patterns (Factory, Strategy, Observer, Chain of Responsibility)
• ✅ Idempotent processing with deduplication
• ✅ Async-ready architecture (Celery structure)
• ✅ SOLID principles and clean code
• ✅ Comprehensive testing and documentation

🏛️ Architecture

┌─────────────────┐    ┌──────────────────┐    ┌─────────────────┐
│   Shopify       │───▶│  Webhook         │───▶│  Handler        │
│   Webhook       │    │  Validator       │    │  Factory        │
└─────────────────┘    └──────────────────┘    └─────────────────┘
                                │                        │
                                ▼                        ▼
                       ┌──────────────────┐    ┌─────────────────┐
                       │  Deduplication   │    │  Strategy       │
                       │  Service         │    │  Selector       │
                       └──────────────────┘    └─────────────────┘
                                │                        │
                                ▼                        ▼
                       ┌──────────────────┐    ┌─────────────────┐
                       │  Database        │    │  Fulfillment    │
                       │  Storage         │    │  Execution      │
                       └──────────────────┘    └─────────────────┘
                                │                        │
                                ▼                        ▼
                       ┌──────────────────┐    ┌─────────────────┐
                       │  Observer        │    │  Result         │
                       │  Notifications   │    │  Response       │
                       └──────────────────┘    └─────────────────┘

🎨 Design Patterns Used

Factory Pattern

Creates appropriate webhook handlers based on event type:

handler = WebhookHandlerFactory.create_handler('orders/create')

Strategy Pattern

Selects fulfillment strategy based on order characteristics:

• AutoFulfillmentStrategy: All items in stock
• PartialFulfillmentStrategy: Some items available
• ManualReviewStrategy: High-value orders (>$1000)
• ExpressFulfillmentStrategy: VIP customers

Observer Pattern

Notifies multiple observers of webhook events:

• LoggingObserver: Detailed event logging
• MetricsObserver: Processing statistics
• NotificationObserver: Alert system

Chain of Responsibility

Validation pipeline:

HMAC Validation → Schema Validation → Deduplication → Business Rules

🚀 Quick Start

Local Development

1. Clone and Setup

git clone <repository-url>
cd shopify_automation_demo
uv sync

2. Environment Configuration

cp .env.example .env
# Edit .env with your configuration

3. Database Setup

uv run python manage.py migrate
uv run python manage.py createsuperuser

4. Run Development Server

uv run python manage.py runserver

Docker Development

# Build and start all services
docker-compose up --build

# Run migrations
docker-compose exec web python manage.py migrate

# Create superuser
docker-compose exec web python manage.py createsuperuser

🧪 Testing Webhooks

Using cURL

curl -X POST http://localhost:8000/webhooks/shopify/ \
  -H "Content-Type: application/json" \
  -H "X-Shopify-Topic: orders/create" \
  -H "X-Shopify-Webhook-Id: unique-id-123" \
  -H "X-Shopify-Shop-Domain: test-shop.myshopify.com" \
  -d @webhooks/tests/fixtures/orders_create.json

Using Management Command

# Simulate different webhook events
uv run python manage.py simulate_webhook orders/create
uv run python manage.py simulate_webhook orders/updated
uv run python manage.py simulate_webhook orders/cancelled

Supported Webhook Events

• orders/create - New order processing
• orders/updated - Order modifications
• orders/cancelled - Order cancellations
• orders/fulfilled - Fulfillment updates
• products/create - New product notifications
• customers/create - Customer registration

📊 Monitoring & Observability

Django Admin Dashboard

• Webhook Events: /admin/webhooks/webhookevent/
• Orders: /admin/webhooks/shopifyorder/
• Fulfillment Tasks: /admin/webhooks/fulfillmenttask/

Logs

# View webhook processing logs
tail -f logs/webhooks.log

# Docker logs
docker-compose logs -f web

Metrics

Processing statistics are automatically tracked:

• Total webhooks processed
• Success/failure rates
• Processing times
• Event type distribution

🔒 Security Features

• HMAC Signature Validation: Verifies webhook authenticity
• Idempotent Processing: Prevents duplicate processing
• Request Size Limits: Protects against large payloads
• SQL Injection Prevention: Django ORM protection
• Environment-based Configuration: No hardcoded secrets

📈 Performance Considerations

• Database Indexing: Optimized queries on webhook_id, order_id
• Redis Caching: Fast deduplication checks
• Async Processing Ready: Celery integration structure
• Connection Pooling: PostgreSQL optimization
• Batch Processing: Scalable for high-volume scenarios

🧪 Running Tests

# Run all tests
uv run python manage.py test

# Run with coverage
uv run pytest --cov=webhooks --cov-report=html

# Run specific test modules
uv run python manage.py test webhooks.tests.test_handlers

📝 API Documentation

Webhook Endpoint

POST /webhooks/shopify/

Headers:

• X-Shopify-Topic: Event type (required)
• X-Shopify-Webhook-Id: Unique webhook ID (required)
• X-Shopify-Shop-Domain: Shop domain (required)
• X-Shopify-Hmac-SHA256: HMAC signature (required in production)

Response:

{
  "status": "success",
  "webhook_id": "unique-id-123",
  "event_topic": "orders/create",
  "result": {
    "fulfillment_method": "automatic",
    "status": "fulfilled",
    "tracking_numbers": ["1Z999AA1234567890"]
  }
}

🎓 Learning Resources

• Design Patterns Documentation
• Webhook Events Guide
• Architecture Deep Dive

💼 Portfolio Highlights

✅ Enterprise Architecture Patterns
✅ Production-Ready Code Quality
✅ Comprehensive Error Handling
✅ Scalable Design (1000+ webhooks/hour)
✅ Docker Containerization
✅ Professional Documentation
✅ SOLID Principles Applied
✅ Test-Driven Development

🛠️ Tech Stack

• Backend: Django 5.0, Django REST Framework
• Database: PostgreSQL (production), SQLite (development)
• Cache: Redis
• Task Queue: Celery (structure ready)
• Containerization: Docker, Docker Compose
• Testing: pytest, factory-boy
• Code Quality: black, flake8, mypy

📄 License

MIT License - see LICENSE file for details.

🤝 Contributing

1. Fork the repository
2. Create a feature branch
3. Make your changes
4. Add tests for new functionality
5. Run the test suite
6. Submit a pull request

📞 Contact

For questions about this portfolio project or potential collaboration opportunities, please reach out through:

• Portfolio: [Your Portfolio URL]
• LinkedIn: [Your LinkedIn Profile]
• Email: [Your Professional Email]

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This project demonstrates enterprise-level set up for high-value e-commerce automation projects.