Unlocking the Secrets of Payment Fund Management: From Domestic to Cross‑Border

Part 01 Introduction

Online payment has been around for 20 years and is deeply embedded in daily life, yet most people only see its surface. Below the surface lies fund management , the silent backbone that supports payment services. This article decodes this crucial domain using WeChat Pay as an illustrative example (unrelated to actual WeChat Pay business).

Part 02 Position of the Fund Middle‑Platform

The fund middle‑platform covers everything related to money; it can be viewed as a black box that interacts with upstream and downstream systems in the payment flow.

Example: a user (Xiaoming) buys a bottle of water for 5 CNY at a 7‑Eleven store using WeChat Pay. The payment system is upstream, and the fund platform must transfer the 5 CNY to the merchant.

The fund platform’s core responsibilities include:

3.1 Reserve‑Account Management

Third‑party payment institutions must hold a reserve account with the central bank; all unsettled funds are deposited there.

Reference: People's Bank of China Announcement No.6 (2013) – Payment Institution Customer Reserve‑Fund Custody Measures People's Bank of China Announcement No.3 (2020) – Revised People's Bank of China Order No.1 (2021) – Non‑Bank Payment Institution Customer Reserve‑Fund Custody Measures (replaces 2013 document)

In practice a payment company may hold multiple reserve accounts, some directly with commercial banks (pre‑direct‑connect) and others with the central bank (post‑direct‑connect). The platform must monitor reserve‑account movements for reconciliation and risk control.

3.2 Internal Account Management

Each user has a balance account (wallet) that increases on recharge or red‑packet receipt and decreases on balance payment. Merchants also have a “merchant balance account”. These are collectively called customer accounts . The counterpart, used only for internal bookkeeping, is the internal account , sometimes represented as a virtual “shadow account” or “position account”.

The overall account hierarchy can be visualised as:

3.3 Settlement

Settlement is the process of paying funds to merchants according to contractual settlement cycles (e.g., real‑time, T+1) and methods (to bank card or to balance).

Settlement cycle: real‑time, T+1, etc.

Settlement method: to card, to balance

For a T+1 settlement the flow looks like:

3.4 Reconciliation

The fund platform must ensure fund safety through a three‑layer reconciliation model:

Detail reconciliation : match transaction details with clearing details to produce a summary bill.

Fund reconciliation : compare the summary bill with bank statements.

Balance reconciliation : verify that ending balances equal previous balances plus today’s movements.

All monetary movements—settlement, refunds, fees—require reconciliation.

3.5 Bookkeeping

Because settlement may be delayed (e.g., T+1), the platform records virtual fund flows using double‑entry bookkeeping. Each transaction creates a debit (D) and a credit (C), ensuring “debits equal credits”. Virtual “shadow accounts” link internal accounts to represent the virtual flow of funds.

3.6 Accounting

Accounting validates the correctness of the books: debit‑credit balance, subject‑level aggregation, and the fundamental accounting equation (Assets = Liabilities + Equity). Accurate accounting prevents risk, supports financial reporting, and informs business decisions.

Part 04 Domestic Payment Summary

A concise diagram summarises the domestic single‑entity payment flow, highlighting fund‑platform interactions, settlement patterns, and timing.

Part 05 Cross‑Border Payment Differences

Cross‑border payments add exponential complexity: multiple entities, banks, currencies, time zones, diverse business models, stricter regulatory requirements, and longer settlement times.

Part 06 Cross‑Border Payment Example

A Chinese user pays 5 CNY for a 1,000 KRW bottle in Korea. The QR code is provided by a Korean acquirer, while WeChat Pay China must coordinate with WeChat Pay Korea and possibly WeChat Pay Hong Kong for FX conversion.

Part 07 Cross‑Border Fund Middle‑Platform

7.1 Fund‑Path Management

Funds flow from the user’s bank to the merchant through several steps: domestic reserve‑fund account, cross‑border special account, FX conversion (CNY→KRW), and finally settlement to the merchant.

The platform selects the optimal path based on speed, cost, and regulatory constraints.

7.2 Foreign‑Exchange (FX) Process

FX involves three stages:

FX Quote : obtain real‑time rate and apply markup at the moment of scanning.

FX Trade : lock the rate (price protection) and execute the trade with a liquidity provider.

Position Management : monitor and hedge the exposure until settlement.

7.3 Clearing and Reconciliation

Unlike domestic payments, cross‑border clearing lacks a single clearing house. The process is split into:

Clearing : the active party calculates the settlement file; the passive party verifies it.

Settlement : funds are transferred according to the clearing result, followed by bank‑statement reconciliation.

7.4 Multi‑Entity Accounting

Cross‑border payments involve multiple legal entities (e.g., WeChat Pay CN, HK, KR) and multiple currencies. Each entity maintains separate ledgers, and internal accounts are aggregated into a multi‑branch tree structure.

7.5 Liquidity Management

Liquidity management ensures sufficient cash across all jurisdictions, predicts fund flows, monitors account balances, and provides a global fund‑allocation mechanism to address shortfalls, especially under FX constraints.

Liquidity management is the process of monitoring, analysing, and optimising cash or cash‑equivalents to meet short‑term financial needs while balancing risk and return.

Part 08 Cross‑Border Payment Summary

A final diagram summarises the end‑to‑end cross‑border payment architecture, highlighting the key challenges of multi‑entity coordination, FX conversion, clearing, and liquidity.

Part 09 Closing Remarks

The author, with years of experience at a top domestic payment provider, will continue sharing deeper insights on fund‑platform design, risk control, FX profitability, and balancing speed with security.