Understanding the End-to-End Architecture of Chinese Internet Payments

The author, a senior architect, introduces the overall structure of Chinese internet payment systems, describing how a simple e‑commerce purchase traverses multiple layers from the front‑end platform to the central bank.

Payment Chain Overview : A user selects a product on an e‑commerce platform (e.g., JD.com), proceeds to the checkout page, which integrates third‑party payment channels such as JD Pay, WeChat Pay, and UnionPay. These channels connect to commercial banks, which forward transactions to clearing networks (UnionPay, NetClear) and finally to the People’s Bank of China.

Key System Components :

Cashier – the UI where users choose payment methods.

Order System – records business orders.

Transaction System – converts business orders into payment orders for the payment core.

Payment Core – handles payment instructions, protocols, and interacts with downstream clearing and accounting systems.

Member System – manages user and merchant identities and relationships.

Accounting Core – maintains account balances and records financial flows.

Clearing Core – applies settlement rules to finalize fund distribution.

The article also outlines the post‑payment settlement flow: after a payment succeeds, data is sent to a clearing center, then to an accounting system for bookkeeping, followed by notifications to internal accounting and finally settlement to merchants.

Additional sections discuss the responsibilities of the cashier (payment vs. recharge), the transaction core, and the importance of a clean, modular architecture for third‑party payment providers.

Overall, the piece demonstrates that building a comprehensive payment platform involves dozens of interconnected subsystems, highlighting the complexity of modern internet payment infrastructure.