Digital Download

Billing webhook fixtures that save the launch week.

BillingWebhookKit Pro is a copy-ready pack for small SaaS teams wiring Lemon Squeezy, Stripe, Paddle, or Polar webhooks. It focuses on signature checks, idempotent retries, provider mapping, PR review reports, and CI release gates.

Checkout opening soon Download free sample Review launch evidence Inspect sample report Delivery and support Verify status Open free generator
Archive Private ZIP delivery after checkout
Manifest 29 files, checksum published
Tests 12 local tests verified
Safety Fake provider data, no paid API calls

Indie SaaS

Validate purchase, renewal, cancellation, license, and failed payment paths before a real customer hits checkout.

Framework Teams

Drop raw-body webhook handlers into Next.js, Hono, Express, or Cloudflare Workers with provider-specific verification notes.

Release Checks

Run fixture-driven tests in CI and attach review reports so billing changes fail before entitlements or customer access are affected.

When It Pays Off

Buy it when the free sample stops being enough

The free sample is enough for a first Lemon Squeezy route. The Pro Kit is aimed at the point where a launch needs repeatable billing checks across provider payloads, framework handlers, retries, and PR review notes.

Launch Risk You are about to accept real payments.

Use the fixtures and tests to catch signature, mapping, duplicate replay, and entitlement mistakes before checkout opens.

Build Time You do not want to assemble webhook test assets from scratch.

Start from a 29-file package with route templates, CI examples, contract tests, and review documentation already organized.

Team Review You need a pull-request artifact for billing changes.

Attach the included review report templates so future maintainers can see what event, field, and idempotency path grants access.

Checkout Launch Gates

What must be proven before a public buy link is worth trusting

The Pro Kit is positioned for the last mile before real checkout traffic: price visibility, paid webhook delivery, signature verification, duplicate replay, fulfillment evidence, and rollback notes.

Checkout smoke test Prove the product page, CN¥69 checkout, paid order webhook, and fulfillment path together. Use the guide to run the live check; use Pro files to keep the evidence and regression tests in the repo. PayPal route Verify PayPal payment success still emits the webhook event your app trusts. The pack gives review report structure for PayPal checkout, order payload, duplicate replay, and fulfillment notes. Currency mismatch Catch custom_price, minor-unit, published variant, and live/test environment mistakes. The public guide explains the failure mode; Pro keeps the price and webhook checks attached to launch review. Release report Generate a PR-ready launch note before the checkout link is shared. The browser report covers the launch moment; Pro adds reusable files, fixtures, and CI checks for future billing changes. Evidence packet Keep checkout, webhook, fulfillment, refund, and buyer-message proof in one buying path. Use the evidence pack to decide what is already covered by free tools and what the Pro Kit should replace with repo files.

Tool-to-Pro Map

What the paid pack adds after the browser tools find the gap

The free tools help diagnose one task in the browser. The Pro Kit turns those outputs into copy-ready files, tests, CI checks, and review artifacts for a product repository.

Payload generator Need repeatable provider examples beyond one pasted payload.

Pro adds Lemon Squeezy, Stripe, Paddle, and Polar fixture files organized for local tests and PR review.

Signature verifier Need raw-body checks that stay enforced in code.

Pro adds route handler patterns and signature tests so the browser check becomes a CI gate.

Mismatch debugger Need the failure cause converted into a regression test.

Pro adds signature mismatch fixtures, raw-body route examples, and review notes for parser, header, and secret mistakes.

Idempotency tool Need process-once behavior under provider retries.

Pro adds idempotency helpers, duplicate replay tests, and database guard notes.

Replay cURL Need replay commands attached to release evidence.

Pro adds replay notes and review report templates for billing route pull requests.

Next.js generator Need handler variants beyond one framework path.

Pro adds Next.js, Hono, Express, and Cloudflare Worker handler templates with provider mapping notes.

Entitlement matrix Need access decisions backed by fixtures and tests.

Pro adds entitlement mapping notes, contract tests, and review report sections for grants, renewals, cancellations, and quarantine paths.

Cost calculator Need the debugging estimate turned into reusable launch evidence.

Pro adds CI examples and review templates that reduce repeated setup time instead of only estimating it in the browser.

Readiness scorecard Need every launch gate documented before checkout opens.

Pro adds checklist docs, CI workflow examples, contract tests, and review reports that match the scorecard gates.

Checkout smoke report Need public checkout evidence attached to the release.

Pro adds review report templates, replay fixtures, and integration checklists for price, paid webhook, idempotency, and fulfillment evidence.

Package Preview

What the download is organized around

The pack is not a hosted service and does not call paid APIs. It is a local engineering asset: fixtures, handlers, test helpers, contract tests, review report templates, CI workflow, and short integration notes that can be copied into a product repo. 

fixtures/
  lemon/order_created.json
  lemon/subscription_payment_success.json
  stripe/checkout_session_completed.json
  paddle/transaction_completed.json
  polar/order_paid.json
src/
  idempotency.ts
  handlers/next-app-router.ts
  handlers/hono.ts
  handlers/express.ts
  handlers/cloudflare-worker.ts
tests/
  lemon-signature.test.ts
  lemon-contract.test.ts
  lemon-idempotency-replay.test.ts
.github/workflows/webhook-checks.yml
README.md
docs/idempotency-runbook.md
docs/contract-tests.md
docs/webhook-review-checklist.md
docs/webhook-review-report-template.md
docs/integration-checklist.md
Version 0.1.0
Files 29
Tests 12 passing
ZIP SHA-256 29443d9d...24f599ad8
View public manifest JSON Check whether CN¥69 is worth it Run the buyer checklist Inspect the Pro sample report Review the AI SaaS billing launch checklist Read delivery, refund, and support policy Review the launch evidence pack View public checkout and package status

Delivery and Verification

What happens after checkout is live

The paid archive is intentionally not published in the public repository. The public manifest gives enough metadata to inspect the package shape before buying and to verify the private ZIP after checkout is connected.

1

Buy the CN¥69 digital pack

When live Lemon Squeezy configuration is connected, the checkout button will open the production purchase flow for the private ZIP.

2

Compare the package hash

Match the downloaded archive against the manifest SHA-256: 29443d9d91e918896049b2c5807e8d2342f0204675bca7eb6a5c2c824f599ad8.

3

Run the local test suite

Install dependencies and run npm install && npm test. The manifest records 3 test files and 12 passing tests.

4

Copy only fake-safe examples

Use fake fixtures and fake signing secrets in public issues. Keep real provider secrets, customer data, and private checkout URLs out of shared reports.

Launch Checklist

Practical failure modes covered

Raw body HMAC verification Webhook contract tests Duplicate event replay Provider field mapping PR-ready review reports License and subscription states CI command examples Webhook route hardening notes

FAQ

Buying and integration details

Does it upload webhook signing secrets?

No. The hosted tool runs in the browser, and the Pro Kit is a local digital download. Secrets stay in your local workflow.

What is different from the free sample?

The sample shows the format. The Pro Kit adds more provider fixtures, framework handlers, tests, review templates, and launch notes.

When should I buy the Pro Kit?

Use the free sample for one route. Buy Pro when you need multiple provider fixtures, handlers, CI tests, duplicate replay checks, and PR review templates together.

Why is checkout opening soon?

The page stays disabled until the live Lemon Squeezy production key and variant are connected, so no test checkout is exposed publicly.

Is it a hosted SaaS?

No. It is a one-time digital pack of local fixtures, handlers, tests, CI examples, and review documentation.

How do I verify the archive?

Compare the downloaded ZIP against the public SHA-256 manifest, then run npm install && npm test locally.

Does it require paid APIs?

No. The tests use fake provider data and local fixtures, so integration checks can run before live provider delivery.

What support and refund handling is available?

The delivery, refund, and support policy explains access, checksum, package defect, duplicate purchase, and safe-reporting handling.