HISTORICAL SPECIFICATION: LEGACY E-COMMERCE CART & CHECKOUT

Document Version: 1.2
Release Date: October 2024
Author: Engineering Architecture Team

1. CORE CART FUNCTIONS
1.1 Cart Session Expiration
- Shopping cart sessions persist for exactly 24 hours. After 24 hours of inactivity, the cart items are cleared from Redis storage.

1.2 Coupon & Discount Application
- The system supports single-coupon code applications.
- Cumulative discounts are not permitted.
- Coupon codes must be verified against their expiration date before subtracting the value from the subtotal.

2. LEGACY PAYMENT INTEGRATION
2.1 Payment Gateway
- The system integrates with Stripe API v2022-11-15.
- Credit cards are authorized and captured in a single transaction.
- 3D Secure version 1.0 (legacy) is used for card validation.

2.2 Refunds & Cancellations
- All refund requests must be initiated by the Customer Support dashboard.
- The refund process takes 3 to 5 business days to credit back to the cardholder account.
- Automated instant refunds are currently unsupported.

3. ARCHITECTURAL LIMITS & DATA retention
3.1 Transaction Logging
- Every payment attempt generates an entry in the transaction log database.
- Transaction logs are stored for a period of 90 days. After 90 days, logs are automatically purged to save database storage capacity.

3.2 Compliance Context
- Under current PDPA regulations, customer details must be encrypted at rest in the MySQL DB using AES-256.