Overview of Payment System Evolution, Architecture, and Integration for Order Processing

Payment is the transfer of monetary claims from payer to payee and is a core capability of e‑commerce products; understanding its history, concepts, architecture, and processes is essential for order domain engineers.

History and Evolution : From ancient ticket offices (票号) and manual inter‑bank clearing before 1989, through electronic inter‑bank clearing (1989‑2005), to modern real‑time payment systems (2005‑present), each stage reduced settlement time and improved efficiency.

Basic Concepts : Defines payment systems, core concepts, and common payment forms such as platform payment, online banking, quick payment, protocol payment, virtual currency, balance payment, and credit payment.

System Overview : Describes third‑party payment channels, aggregation payment systems, overall architecture, payment flow, interfaces (payment, transaction close, query, refund, reconciliation), and the separation of funds and information flows.

Risk Control and Reliability : Covers fund safety, idempotency, retry mechanisms, reconciliation (consistency, business correctness, timeliness, risk limits), and chaos engineering for loss‑prevention.

Order‑Payment Interaction : Explains order creation, 0‑yuan order handling, expiration time design, and the two interaction modes (order‑side creation vs. pay‑info SPI reverse lookup).

In summary, a solid grasp of payment system design, flow, and safeguards helps order engineers manage the four‑flow model of e‑commerce and adopt best practices from the industry.