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Saturday, May 23, 2026
Da Nang, Vietnam — 11:24:00 PM
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API INTEGRATION • E-COMMERCE AUTOMATION • APPLIED AI RESEARCH
Portrait of Phạm Khánh Minh Mẫn

Phạm Khánh Minh Mẫn (Pham Khanh Minh Man, PKMM) — Backend engineer, 5 years on e-commerce systems and multi-marketplace API integration.

I write and maintain open-source clients for the Shopee, TikTok Shop and Lazada Open APIs — request signing, token refresh, webhooks.

Currently at DiproTech on manufacturing simulation, subscription billing and content platforms for Japanese clients. Since 2026, a graduate student in Computer Science at Danang University of Science and Technology.

REPRESENTATIVE LIBRARIES & PACKAGES

[ Last week stats from npmjs.org ]
Shopee

Shopee API Client

API Client • v1.0.81,240/week
npm i shopee-api-client

TypeScript client for Shopee Open API v2. Covers seller authorization, token management, orders, products, logistics, and payment escrow.

GitHub npmDetails →
TikTok Shop

TikTok Shop API Client

API Client • v1.0.6890/week
npm i tiktokshops-api-client

TypeScript API client for TikTok Shop Open API. Covers seller authorization, order APIs, product APIs, and fulfillment APIs.

GitHub npmDetails →
Lazada

Lazada API Client

API Client • v1.0.6620/week
npm i lazada-api-client

TypeScript API client for Lazada Open API. Covers seller authorization, order APIs, and product APIs.

GitHub npmDetails →

All-in-One Package

Monorepo • v4.3.16340/week
npm i shopee-tiktokshops-lazada-api

Bundles the Shopee, TikTok Shop and Lazada SDKs into a single dependency, with versions kept in sync automatically.

GitHub npmDetails →

RESEARCH — GRADUATE WORK

[ In progress ]
2026 — presentExploratory — no published results

When Does Graph Memory Help Beyond Verbalized Relations? Isolating Representation from Structure in LLM-Agent Memory

Independent research — not committed as a thesis topic

Graph memory is widely believed to help LLM agents remember better. But when graph memory is compared against flat memory, existing work changes TWO things at once: structure (the ability to traverse relations) and representation (information rewritten as typed relational sentences — unavoidable, because an LLM can only read text). So which of the two does the observed benefit belong to?

LLM agent memoryKnowledge graphRetrievalAblation studyPre-registrationCluster-aware statistics
Full method & status →

TECHNICAL ARTICLES & GUIDES

[ Notes from production systems ]
27Aug

PostgreSQL has four isolation levels. You only get three.

The isolation table everyone copies belongs to the SQL standard, not to PostgreSQL. Measured on PostgreSQL 16: READ UNCOMMITTED is accepted and quietly ignored, Repeatable Read blocks phantoms the standard says it should allow, a plain SELECT at Repeatable Read blocks a writer for 1ms against 4003ms for a real lock, and the one anomaly that separates Repeatable Read from Serializable costs you a 40001 you have to retry.

21Aug

Overselling in a flash sale: which lock to reach for, and when you need none

A flash sale with 100 shirts in stock took 200 orders — and the stock column still read 94. Measured on real PostgreSQL: the one-line fix nobody reaches for first, the lock that makes checkout 149× slower, the case where pessimistic locking cannot be used at all, and why a perfectly correct row lock still loses inventory once a queue is in the path.

24Aug

Three calls get you a Shopee token. Keeping it alive is the hard part.

The quick start is three functions long and works first try against your own test shop. What it leaves out: the auth endpoints sign differently from every other call, the refresh token is single-use so two workers will quietly kill each other's copy, and the thing that actually expires is the seller's authorization — which you cannot read from the token in your hand.