Payment Business Architecture: Process Decomposition, Sequence Design, and Structural Design

1. Business Background

Payment‑related functions are common in business systems, and inexperienced developers often find the settlement logic daunting because any detail error can cause reconciliation problems, leading to costly manual interventions.

2. Payment Business

2.1 Process Decomposition

Complex business should be split into manageable modules; the article shows a typical transaction scenario divided into four modules: account management, transaction flow, payment integration, and order structure.

2.2 Sequence Design

The payment process is divided into three core phases: pre‑payment (order creation, inventory check, fund freeze), payment integration (third‑party request and response handling), and post‑payment (status update, fund settlement, inventory adjustment).

2.3 Structural Design

Based on the analysis, a basic data model is proposed, covering account balances, transaction records, transaction details, payment integration logs, order records, and order details.

3. Related Business

Beyond the core payment flow, related domains such as product management, inventory, logistics, and coupon rules interact with the payment process, requiring coordinated handling of stock, discounts, and refunds.

4. Practical Summary

Business model: clear understanding and modular decomposition.

Transaction management: use TCC (Try‑Confirm‑Cancel) pattern.

Locking & retry: lock order IDs to avoid duplicate processing.

Fund settlement: ensure precision and auditability.

Process maintenance: provide visual workflow tools and manual maintenance mechanisms.

The article concludes that mastering the core logic, iteratively refining the design, and maintaining a clear data structure are essential for handling complex payment scenarios.