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docs/modules/retail/README.md

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+# Retail Module Documentation
+
+## Overview
+
+The Retail Module provides comprehensive retail management capabilities for Malaysian SMEs, including inventory management, sales processing, customer relationship management, and loyalty programs.
+
+## Features
+
+### Core Features
+- **Product Management**: Complete product catalog with SKU, barcode, and categorization
+- **Inventory Tracking**: Real-time stock monitoring with alerts and reporting
+- **Sales Processing**: Point-of-sale functionality with payment integration
+- **Customer Management**: Customer profiles and purchase history
+- **Loyalty Programs**: Tiered loyalty system with points and rewards
+- **Reporting**: Sales analytics and inventory reports
+
+### Malaysian Market Features
+- **SST Compliance**: Automatic SST calculation and reporting
+- **Halal Certification**: Support for halal product certification
+- **Malaysian Address Format**: Integrated Malaysian address validation
+- **Local Payment Methods**: Support for Touch 'n Go, GrabPay, and bank transfers
+- **Cultural Preferences**: Support for Malaysian shopping patterns and holidays
+
+## Architecture
+
+### Models
+- **Product**: Product catalog with attributes and pricing
+- **Inventory**: Stock tracking and movement history
+- **Sale**: Sales transactions with payment processing
+- **Customer**: Customer profiles and loyalty data
+- **LoyaltyProgram**: Loyalty tiers and reward structures
+
+### Services
+- **ProductService**: Product catalog management
+- **InventoryService**: Stock tracking and alerts
+- **SaleService**: Sales processing and payment handling
+- **CustomerService**: Customer relationship management
+- **LoyaltyService**: Loyalty program management
+
+### API Endpoints
+- `/api/v1/retail/products/` - Product management
+- `/api/v1/retail/inventory/` - Inventory management
+- `/api/v1/retail/sales/` - Sales processing
+- `/api/v1/retail/customers/` - Customer management
+- `/api/v1/retail/loyalty/` - Loyalty program
+
+## Configuration
+
+### Module Settings
+```json
+{
+  "retail": {
+    "enable_loyalty_program": true,
+    "enable_inventory_alerts": true,
+    "enable_barcode_scanning": true,
+    "enable_sst_calculation": true,
+    "default_tax_rate": 0.06,
+    "low_stock_threshold": 10,
+    "loyalty_tiers": {
+      "bronze": { "min_points": 0, "discount_rate": 0.0 },
+      "silver": { "min_points": 1000, "discount_rate": 0.05 },
+      "gold": { "min_points": 5000, "discount_rate": 0.10 },
+      "platinum": { "min_points": 10000, "discount_rate": 0.15 }
+    }
+  }
+}
+```
+
+### Malaysian Configuration
+```json
+{
+  "malaysian_retail": {
+    "sst_enabled": true,
+    "sst_rate": 0.06,
+    "halal_certification_required": false,
+    "supported_payment_methods": [
+      "cash",
+      "credit_card",
+      "debit_card",
+      "touch_n_go",
+      "grabpay",
+      "boost",
+      "online_banking"
+    ],
+    "operating_hours": {
+      "timezone": "Asia/Kuala_Lumpur",
+      "public_holidays": true,
+      "prayer_times": false
+    }
+  }
+}
+```
+
+## Getting Started
+
+### 1. Enable Module
+```json
+POST /api/v1/modules/retail/enable/
+{
+  "tenant_id": "your_tenant_id",
+  "configuration": {
+    "enable_loyalty_program": true,
+    "enable_inventory_alerts": true
+  }
+}
+```
+
+### 2. Set Up Products
+```json
+POST /api/v1/retail/products/
+{
+  "sku": "PRD-2024-001",
+  "name": "Premium Product",
+  "category": "electronics",
+  "price": 299.00,
+  "tax_rate": 0.06,
+  "current_stock": 50
+}
+```
+
+### 3. Configure Inventory Alerts
+```json
+POST /api/v1/retail/inventory/settings/
+{
+  "low_stock_threshold": 10,
+  "overstock_threshold": 500,
+  "email_notifications": true
+}
+```
+
+## Best Practices
+
+### Inventory Management
+1. **Regular Stock Takes**: Perform weekly inventory counts
+2. **ABC Analysis**: Categorize products by value and sales volume
+3. **Safety Stock**: Maintain minimum stock levels for popular items
+4. **Seasonal Planning**: Adjust inventory based on Malaysian seasons and holidays
+
+### Customer Management
+1. **Data Collection**: Collect customer preferences and purchase history
+2. **Loyalty Engagement**: Regular loyalty program promotions
+3. **Personalized Marketing**: Target customers based on purchase patterns
+4. **Customer Retention**: Focus on repeat customer engagement
+
+### Sales Processing
+1. **Payment Diversity**: Support multiple Malaysian payment methods
+2. **SST Compliance**: Ensure proper SST calculation and documentation
+3. **Receipt Management**: Digital and physical receipt options
+4. **Returns Processing**: Clear return and refund policies
+
+## Integration Capabilities
+
+### Payment Gateways
+- Malaysian banks (Maybank, CIMB, RHB, etc.)
+- E-wallets (Touch 'n Go, GrabPay, Boost)
+- Credit card processors
+
+### Accounting Software
+- Malaysian accounting software integration
+- General ledger synchronization
+- Financial reporting
+
+### E-commerce Platforms
+- Shopee Malaysia integration
+- Lazada Malaysia integration
+- Custom e-commerce solutions
+
+## Malaysian Compliance
+
+### SST Requirements
+- 6% SST rate on applicable products and services
+- Proper SST invoice formatting
+- SST reporting and filing
+- Exempt item handling
+
+### Consumer Protection
+- Price display regulations
+- Return and refund policies
+- Product safety standards
+- Consumer rights compliance
+
+### Halal Certification
+- JAKIM certification support
+- Halal product labeling
+- Supplier verification
+- Certification tracking
+
+## Troubleshooting
+
+### Common Issues
+1. **Inventory Mismatch**: Reconcile physical vs system stock
+2. **Payment Failures**: Check payment gateway configuration
+3. **SST Calculation**: Verify tax rates and product categories
+4. **Customer Data**: Ensure proper data entry and validation
+
+### Support Resources
+- User guide and training materials
+- Video tutorials for common operations
+- FAQ section for quick troubleshooting
+- Contact support for complex issues
+
+## Updates and Maintenance
+
+### Regular Updates
+- Monthly security patches
+- Quarterly feature updates
+- Annual compliance updates
+- Malaysian regulatory changes
+
+### Backup and Recovery
+- Automated daily backups
+- Point-in-time recovery
+- Data validation procedures
+- Disaster recovery planning
+
+## Performance Optimization
+
+### Database Optimization
+- Index optimization for product searches
+- Query optimization for reporting
+- Data archiving for historical records
+- Connection pooling for high traffic
+
+### Caching Strategy
+- Product catalog caching
+- Customer data caching
+- Report result caching
+- Session management optimization
+
+## Security Considerations
+
+### Data Protection
+- PDPA compliance for customer data
+- Secure payment processing
+- Data encryption at rest and in transit
+- Access control and audit logging
+
+### Payment Security
+- PCI DSS compliance
+- Fraud detection and prevention
+- Secure payment gateway integration
+- Transaction monitoring
+
+## Migration and Data Import
+
+### Data Migration
+- CSV import templates
+- Data validation procedures
+- Migration checklist
+- Post-migration verification
+
+### Legacy Integration
+- API integration capabilities
+- Database synchronization
+- Legacy system retirement planning
+- Data transformation services