Webhook Failure Lab — Stripe + TypeScript

Reproduce three webhook bugs locally before they reach your customers. Compare broken and corrected TypeScript handlers, run the demos, and adapt the regression tests to your own application.

WHAT YOU GET FOR US$19

• Duplicate delivery: stop the same event from granting local credits twice.

• Out-of-order delivery: reconcile current subscription state instead of trusting an old event snapshot.

• Premature acknowledgment: persist work before returning 200 so a receiver restart does not lose it.

• Three offline labs, 20 tests, SQLite schemas, walkthroughs, and an adaptation guide.

• A ZIP of readable source code. One-time purchase of version 0.1.

TRY THE FREE SAMPLE FIRST

Download the free sample

The free sample includes the complete duplicate-delivery lab and its 10 tests. This paid package includes that same lab plus the other two labs and combined walkthrough/adaptation guides.

REQUIREMENTS

Node.js 24.18 or newer; basic JavaScript/TypeScript, HTTP, and SQL knowledge. Verified on Windows with Node 24.18.0. Extract the ZIP, run npm run demo, then npm test. No npm install, Stripe account, API keys, or Docker required.

SCOPE AND USAGE

Synthetic, offline educational examples. No live HTTP endpoint, Stripe signature verification, or drop-in billing integration. The ordering example uses a single-process lock. Local database guarantees do not make external actions exactly-once or deduplicate different event IDs for the same business action.

Adapt the code for personal, commercial, and client applications and share the paid package within your immediate project team under the included usage terms. Do not resell or publicly redistribute the paid package as a competing download. No hosted service, custom integration, security audit, warranty of suitability, or promised future updates are included.

Independent product; not endorsed by Stripe.