# BillingWebhookKit

> Browser-only Lemon Squeezy webhook test generator for payment webhook fixtures, raw-body HMAC signature verification, payload inspection, duplicate replay simulation, debugging cost estimates, review report export, cURL replay commands, and framework handlers.

BillingWebhookKit helps indie SaaS developers test billing webhook routes before launch. It runs in the browser, verifies pasted webhook signatures locally, debugs signature mismatches, inspects raw webhook bodies for trusted billing fields, builds idempotency keys, generates contract tests, recommends idempotency keys, simulates duplicate webhook replays, maps events to entitlement decisions, scores launch readiness, estimates webhook debugging cost, exports PR-ready Markdown review reports, and does not upload webhook signing secrets.

## URLs

- Home: https://qihaze123.github.io/billing-webhook-kit/
- Guide index: https://qihaze123.github.io/billing-webhook-kit/guides/
- Tool index: https://qihaze123.github.io/billing-webhook-kit/tools/
- Lemon Squeezy webhook troubleshooting hub: https://qihaze123.github.io/billing-webhook-kit/troubleshooting.html
- Standalone Lemon Squeezy checkout smoke test report: https://qihaze123.github.io/billing-webhook-kit/tools/lemon-squeezy-checkout-smoke-test-report.html
- Standalone Lemon Squeezy webhook endpoint smoke test: https://qihaze123.github.io/billing-webhook-kit/tools/lemon-squeezy-webhook-endpoint-smoke-test.html
- Standalone Lemon Squeezy live/test mode checker: https://qihaze123.github.io/billing-webhook-kit/tools/lemon-squeezy-live-test-mode-checker.html
- Standalone Lemon Squeezy PayPal live checkout report: https://qihaze123.github.io/billing-webhook-kit/tools/lemon-squeezy-paypal-live-checkout-report.html
- Standalone Lemon Squeezy production checkout readiness report: https://qihaze123.github.io/billing-webhook-kit/tools/lemon-squeezy-production-checkout-readiness-report.html
- Standalone Lemon Squeezy fulfillment checklist generator: https://qihaze123.github.io/billing-webhook-kit/tools/lemon-squeezy-fulfillment-checklist-generator.html
- Standalone Lemon Squeezy refund rollback report generator: https://qihaze123.github.io/billing-webhook-kit/tools/lemon-squeezy-refund-rollback-report.html
- Standalone Lemon Squeezy delivery email template generator: https://qihaze123.github.io/billing-webhook-kit/tools/lemon-squeezy-delivery-email-template-generator.html
- Standalone Lemon Squeezy webhook event coverage matrix: https://qihaze123.github.io/billing-webhook-kit/tools/lemon-squeezy-webhook-event-coverage-matrix.html
- Standalone billing webhook launch readiness scorecard: https://qihaze123.github.io/billing-webhook-kit/tools/billing-webhook-launch-readiness-scorecard.html
- Standalone billing webhook debug cost calculator: https://qihaze123.github.io/billing-webhook-kit/tools/billing-webhook-debug-cost-calculator.html
- Standalone checkout provider decision matrix: https://qihaze123.github.io/billing-webhook-kit/tools/checkout-provider-decision-matrix.html
- Standalone BillingWebhookKit Pro fit checker: https://qihaze123.github.io/billing-webhook-kit/tools/billing-webhook-pro-fit-checker.html
- Standalone Lemon Squeezy payload generator: https://qihaze123.github.io/billing-webhook-kit/tools/lemon-squeezy-webhook-payload-generator.html
- Standalone Lemon Squeezy x-signature verifier: https://qihaze123.github.io/billing-webhook-kit/tools/lemon-squeezy-signature-verifier.html
- Standalone webhook signature mismatch debugger: https://qihaze123.github.io/billing-webhook-kit/tools/webhook-signature-mismatch-debugger.html
- Standalone webhook idempotency key generator: https://qihaze123.github.io/billing-webhook-kit/tools/webhook-idempotency-key-generator.html
- Standalone Stripe webhook fixture generator: https://qihaze123.github.io/billing-webhook-kit/tools/stripe-webhook-fixture-generator.html
- Standalone webhook replay cURL generator: https://qihaze123.github.io/billing-webhook-kit/tools/webhook-replay-curl-generator.html
- Standalone Next.js webhook handler generator: https://qihaze123.github.io/billing-webhook-kit/tools/nextjs-webhook-handler-generator.html
- Standalone Next.js Lemon Squeezy raw body audit: https://qihaze123.github.io/billing-webhook-kit/tools/nextjs-lemon-squeezy-raw-body-audit.html
- Standalone Vercel Lemon Squeezy webhook debugger: https://qihaze123.github.io/billing-webhook-kit/tools/vercel-lemon-squeezy-webhook-debugger.html
- Standalone payment webhook test plan generator: https://qihaze123.github.io/billing-webhook-kit/tools/payment-webhook-test-plan-generator.html
- Fix Next.js 405 for Lemon Squeezy webhooks: https://qihaze123.github.io/billing-webhook-kit/guides/nextjs-webhook-405-lemon-squeezy.html
- Fix Lemon Squeezy webhook 500 on Vercel and Next.js: https://qihaze123.github.io/billing-webhook-kit/guides/lemon-squeezy-webhook-500-vercel-nextjs.html
- Lemon Squeezy webhook retry and idempotency guide: https://qihaze123.github.io/billing-webhook-kit/guides/lemon-squeezy-webhook-retry-idempotency.html
- Payment webhook test tool alternatives: https://qihaze123.github.io/billing-webhook-kit/guides/payment-webhook-test-tool-alternatives.html
- Standalone webhook entitlement decision matrix generator: https://qihaze123.github.io/billing-webhook-kit/tools/webhook-entitlement-decision-matrix.html
- Free sample: https://qihaze123.github.io/billing-webhook-kit/free-sample.html
- Free sample GitHub release: https://github.com/qihaze123/billing-webhook-kit/releases/tag/v0.1.0
- Pro Kit preview: https://qihaze123.github.io/billing-webhook-kit/pro-kit.html
- BillingWebhookKit Pro sample report: https://qihaze123.github.io/billing-webhook-kit/billing-webhook-kit-pro-sample-report.html
- AI SaaS billing webhook checklist: https://qihaze123.github.io/billing-webhook-kit/guides/ai-saas-billing-webhook-checklist.html
- Lemon Squeezy vs Stripe webhooks for AI SaaS: https://qihaze123.github.io/billing-webhook-kit/guides/lemon-squeezy-vs-stripe-webhooks-ai-saas.html
- BillingWebhookKit pricing ROI guide: https://qihaze123.github.io/billing-webhook-kit/guides/billing-webhook-kit-pricing-roi.html
- BillingWebhookKit buyer checklist: https://qihaze123.github.io/billing-webhook-kit/guides/billing-webhook-kit-buyer-checklist.html
- Stripe webhook test plan for Next.js: https://qihaze123.github.io/billing-webhook-kit/guides/stripe-webhook-test-plan-nextjs.html
- Stripe invoice.paid webhook in Next.js: https://qihaze123.github.io/billing-webhook-kit/guides/stripe-invoice-paid-webhook-nextjs.html
- Stripe invoice.payment_failed webhook in Next.js: https://qihaze123.github.io/billing-webhook-kit/guides/stripe-invoice-payment-failed-webhook-nextjs.html
- Stripe webhook order of events in Next.js: https://qihaze123.github.io/billing-webhook-kit/guides/stripe-webhook-order-of-events-nextjs.html
- Paddle webhook signature verification in Next.js: https://qihaze123.github.io/billing-webhook-kit/guides/paddle-webhook-signature-verification-nextjs.html
- Next.js Paddle webhook handler: https://qihaze123.github.io/billing-webhook-kit/guides/nextjs-paddle-webhook-handler.html
- Paddle webhook test plan for Next.js: https://qihaze123.github.io/billing-webhook-kit/guides/paddle-webhook-test-plan-nextjs.html
- Billing webhook launch evidence pack: https://qihaze123.github.io/billing-webhook-kit/billing-webhook-launch-evidence-pack.html
- Lemon Squeezy production checkout go-live checklist: https://qihaze123.github.io/billing-webhook-kit/guides/lemon-squeezy-production-checkout-go-live.html
- Lemon Squeezy production webhook troubleshooting checklist: https://qihaze123.github.io/billing-webhook-kit/guides/lemon-squeezy-production-webhook-troubleshooting.html
- Delivery, refund, and support policy: https://qihaze123.github.io/billing-webhook-kit/delivery-refund-support.html
- Public status: https://qihaze123.github.io/billing-webhook-kit/status.html
- Free Lemon Squeezy webhook test tools: https://qihaze123.github.io/billing-webhook-kit/free-lemon-squeezy-webhook-test-tools.html
- Search Console sitemap submission handoff: https://qihaze123.github.io/billing-webhook-kit/search-console-sitemap-submission.html
- Google indexing priority queue: https://qihaze123.github.io/billing-webhook-kit/google-indexing-priority.html
- Lemon Squeezy refund webhook test guide: https://qihaze123.github.io/billing-webhook-kit/guides/lemon-squeezy-refund-webhook-test.html
- Pro Kit manifest: https://qihaze123.github.io/billing-webhook-kit/pro-kit-manifest.json
- Sitemap: https://qihaze123.github.io/billing-webhook-kit/sitemap.xml
- HTML sitemap: https://qihaze123.github.io/billing-webhook-kit/sitemap.html
- GitHub: https://github.com/qihaze123/billing-webhook-kit
- Lemon Squeezy webhook checklist Gist: https://gist.github.com/qihaze123/3a13c5533c0e4fe69a3b0759668e9789
- Next.js Lemon Squeezy raw-body checklist Gist: https://gist.github.com/qihaze123/2454b3cf56333186eb3f6de89cc51927
- Lemon Squeezy production checkout go-live checklist Gist: https://gist.github.com/qihaze123/030e189b70aca77bd37bdc271012c38d
- Vercel Lemon Squeezy webhook debugger checklist Gist: https://gist.github.com/qihaze123/9c7b6379513f6b66161451cb0cea1166
- Lemon Squeezy webhook endpoint smoke test checklist Gist: https://gist.github.com/qihaze123/f0de1d548e7e5887d8d6e7341b4c7629

## Core Use Cases

- Generate Lemon Squeezy `order_created`, subscription, cancellation, payment success, and license key webhook payloads.
- Generate and verify HMAC SHA-256 signatures for local webhook tests.
- Compare received `x-signature` header values against exact raw request bodies.
- Debug webhook signature mismatches caused by changed raw bodies, wrong endpoint secrets, header format issues, framework body parsers, and cURL replay mistakes.
- Generate a PR-ready mismatch report for raw-body mutation, signature format, JSON reserialization, CRLF, and framework parser issues.
- Inspect pasted or generated webhook payloads for event name, object ID, status, amount, customer, target record, and recommended handler action.
- Build stable webhook idempotency keys from provider, uniqueness scope, event name, and object ID.
- Generate payment webhook contract tests from trusted event, object, status, customer, currency, and idempotency fields.
- Extract a stable webhook idempotency key pattern before writing billing side effects.
- Simulate three duplicate webhook deliveries and export a process-once/skip-duplicate Vitest snippet.
- Map payment webhook events to entitlement decisions such as one-time access grants, license delivery, subscription activation, renewal extension, scheduled cancellation, failed-payment hold, and unknown-event quarantine.
- Score billing webhook launch readiness across signature tests, duplicate replay, entitlement decisions, fixtures, deployment secrets, checkout smoke tests, review reports, and monitoring.
- Estimate webhook debugging exposure from hourly rate, launch count, and debug hours.
- Export a Markdown webhook review report for pull requests, release checklists, and billing route audits.
- Generate cURL replay commands for local, tunnel, staging, and CI routes.
- Copy starter webhook handlers for Next.js, Hono, and Express.
- Build a payment webhook audit log for Next.js raw-body hashes, signature results, idempotency keys, entitlement decisions, replay evidence, and support-safe launch review.
- Design a payment webhook dead letter queue for Next.js failed events, replay commands, idempotency keys, entitlement safety, and launch evidence.
- Build replay-safe payment webhook fulfillment in Next.js with paid-state checks, idempotency keys, delivery locks, checksum evidence, duplicate replay tests, and refund rollback.
- Generate a provider-specific webhook entitlement decision matrix for SaaS access grants, renewals, cancellations, failed payments, and unknown-event quarantine.
- Debug Vercel and Next.js Lemon Squeezy webhook launch failures such as 404, 405, 500, missing order_created delivery, invalid x-signature, raw-body regressions, missing env vars, and weak PR evidence.
- Generate a PR-ready payment webhook test plan for Lemon Squeezy, Stripe, Paddle, or Polar with raw-body signature verification, contract fields, idempotency, duplicate replay, entitlement decisions, checkout smoke, fulfillment, refund rollback, and CI gates.
- Plan Stripe webhook tests for Next.js App Router routes with checkout.session.completed fixtures, invoice.paid fixtures, raw-body signature checks, duplicate replay, entitlement decisions, and CI release gates.
- Verify Paddle webhook signatures in Next.js App Router with exact raw request bodies, Paddle-Signature headers, signed fixtures, duplicate replay tests, and CI release gates.
- Build a Next.js Paddle webhook handler with request.text(), Paddle-Signature verification, transaction.completed mapping, idempotency, duplicate replay tests, and CI gates.
- Plan Paddle webhook tests for Next.js App Router routes with Paddle-Signature raw-body checks, transaction.completed fixtures, subscription lifecycle fixtures, duplicate replay, entitlement decisions, and CI release gates.
- Calculate avoidable billing webhook debugging cost and compare it with the CNY 69 Pro Kit reference price.
- Check AI-generated and vibe-coded SaaS billing routes before exposing Lemon Squeezy, Stripe, Paddle, or Polar checkout links.
- Compare Lemon Squeezy and Stripe webhook launch checks for AI SaaS apps before committing to a checkout provider.
- Generate a checkout provider decision matrix for AI SaaS teams comparing Lemon Squeezy, Stripe, Paddle, and Polar webhook launch risks.
- Decide whether the CN¥69 Pro Kit is worth buying by comparing free tools, manual webhook test setup time, duplicate replay coverage, launch evidence, and break-even math.
- Preview a sample Pro Kit webhook review report with signature evidence, duplicate replay checks, entitlement decisions, CI coverage, launch notes, and secret-free buyer safeguards.
- Learn billing webhook idempotency and CI test patterns.
- Run a Lemon Squeezy checkout smoke test before exposing a paid checkout link.
- Generate a PR-ready Lemon Squeezy checkout smoke test report for price, checkout URL, paid webhook delivery, duplicate replay, fulfillment, and rollback evidence.
- Generate a PR-ready Lemon Squeezy webhook endpoint smoke test report for endpoint URL, POST method, mode alignment, subscribed events, 2xx response, x-signature, retries, and routing.
- Generate a secret-free Lemon Squeezy live/test mode alignment report for checkout, variant, store, webhook endpoint, signing secret, order payload, and fulfillment route evidence.
- Generate a PR-ready Lemon Squeezy PayPal live checkout report for CN¥69 price visibility, PayPal checkout, paid webhook delivery, x-signature verification, duplicate replay, private delivery, refund rollback, support evidence, and owner approval.
- Generate a PR-ready Lemon Squeezy production checkout readiness report for live key setup, CN¥69 price, PayPal checkout, signed webhooks, duplicate replay, private delivery, refund rollback, support policy, and release evidence.
- Troubleshoot Lemon Squeezy production webhooks after live checkout with paid order_created delivery, x-signature verification, duplicate replay, private fulfillment, refund rollback, and release evidence.
- Generate a PR-ready Lemon Squeezy fulfillment checklist report for signed paid events, live variant checks, private ZIP delivery, idempotency, checksum evidence, support policy, and rollback notes.
- Generate a PR-ready Lemon Squeezy refund rollback report for signed refund events, entitlement revocation, duplicate replay safety, support evidence, and secret-free release review.
- Generate Lemon Squeezy buyer delivery, resend, and support email templates for private ZIP delivery, checksum evidence, refund boundaries, and safe issue reporting.
- Generate a Lemon Squeezy webhook event coverage matrix for order_created, subscription, payment, license key, paid-state, x-signature, idempotency, and duplicate replay checks.
- Debug Lemon Squeezy checkout 404 failures caused by `custom_price`, store currency, unpublished variants, stale checkout URLs, and live/test environment mismatch.
- Test Lemon Squeezy PayPal checkout launch readiness with checkout page, paid `order_created` webhook delivery, signature verification, duplicate replay, fulfillment, and rollback evidence.
- Move from private Lemon Squeezy production checkout testing to a public buy link with live config, CN¥69 pricing, PayPal checkout, signed paid webhooks, duplicate replay, private delivery, refund rollback, support notes, and release evidence.
- Deliver a private ZIP, license file, or digital product after Lemon Squeezy checkout with signed webhook verification, idempotency, checksum evidence, support policy, and duplicate replay safety.
- Handle Lemon Squeezy download email not received support cases with paid-order checks, private resend safety, checksum verification, duplicate-purchase handling, and refund boundaries.
- Test Lemon Squeezy refund webhook rollback, duplicate replay, access revocation, support evidence, and secret-free buyer reports before launch.
- Verify Stripe webhook signatures in Next.js App Router without losing raw request bodies.
- Build a Next.js payment webhook entitlement test matrix for paid checkout, renewal, cancellation, refund, failed payment, duplicate replay, unknown events, and CI gates.
- Build a Next.js payment webhook refund rollback test with signed fixtures, idempotency, entitlement revocation, support evidence, duplicate replay, and CI gates.
- Test Stripe refund webhook rollback in Next.js with `charge.refunded`, `refund.created`, disputes, raw-body `Stripe-Signature` verification, idempotency, entitlement revocation, and CI evidence.
- Test Stripe subscription cancellation webhooks in Next.js with `customer.subscription.deleted`, `customer.subscription.updated`, `cancel_at_period_end`, `invoice.payment_failed`, raw-body `Stripe-Signature` verification, idempotency, and entitlement decisions.
- Test Stripe `invoice.paid` renewal webhooks in Next.js with raw-body `Stripe-Signature` verification, `billing_reason` checks, idempotent entitlement extension, duplicate replay, and CI evidence.
- Test Stripe `invoice.payment_failed` webhooks in Next.js with raw-body `Stripe-Signature` verification, `billing_reason` checks, dunning state, entitlement holds, duplicate replay, and CI evidence.
- Handle Stripe webhook event order in Next.js with `checkout.session.completed`, `invoice.paid`, subscription lifecycle events, out-of-order delivery, idempotency, duplicate replay, and entitlement reconciliation.

## Important Pages

- BillingWebhookKit Pro preview: https://qihaze123.github.io/billing-webhook-kit/pro-kit.html
- BillingWebhookKit Pro sample report: https://qihaze123.github.io/billing-webhook-kit/billing-webhook-kit-pro-sample-report.html
- BillingWebhookKit launch evidence pack: https://qihaze123.github.io/billing-webhook-kit/billing-webhook-launch-evidence-pack.html
- BillingWebhookKit delivery, refund, and support policy: https://qihaze123.github.io/billing-webhook-kit/delivery-refund-support.html
- BillingWebhookKit public status: https://qihaze123.github.io/billing-webhook-kit/status.html
- BillingWebhookKit free Lemon Squeezy webhook test tools: https://qihaze123.github.io/billing-webhook-kit/free-lemon-squeezy-webhook-test-tools.html
- BillingWebhookKit Search Console sitemap submission handoff: https://qihaze123.github.io/billing-webhook-kit/search-console-sitemap-submission.html
- BillingWebhookKit Google indexing priority queue: https://qihaze123.github.io/billing-webhook-kit/google-indexing-priority.html
- BillingWebhookKit Lemon Squeezy webhook troubleshooting hub: https://qihaze123.github.io/billing-webhook-kit/troubleshooting.html
- BillingWebhookKit HTML sitemap: https://qihaze123.github.io/billing-webhook-kit/sitemap.html
- BillingWebhookKit tool index: https://qihaze123.github.io/billing-webhook-kit/tools/
- BillingWebhookKit standalone checkout smoke test report: https://qihaze123.github.io/billing-webhook-kit/tools/lemon-squeezy-checkout-smoke-test-report.html
- BillingWebhookKit standalone endpoint smoke test: https://qihaze123.github.io/billing-webhook-kit/tools/lemon-squeezy-webhook-endpoint-smoke-test.html
- BillingWebhookKit standalone live/test mode checker: https://qihaze123.github.io/billing-webhook-kit/tools/lemon-squeezy-live-test-mode-checker.html
- BillingWebhookKit standalone PayPal live checkout report: https://qihaze123.github.io/billing-webhook-kit/tools/lemon-squeezy-paypal-live-checkout-report.html
- BillingWebhookKit standalone production checkout readiness report: https://qihaze123.github.io/billing-webhook-kit/tools/lemon-squeezy-production-checkout-readiness-report.html
- BillingWebhookKit standalone live checkout launch command builder: https://qihaze123.github.io/billing-webhook-kit/tools/lemon-squeezy-live-checkout-launch-command.html
- BillingWebhookKit standalone fulfillment checklist generator: https://qihaze123.github.io/billing-webhook-kit/tools/lemon-squeezy-fulfillment-checklist-generator.html
- BillingWebhookKit standalone paid order delivery incident report: https://qihaze123.github.io/billing-webhook-kit/tools/lemon-squeezy-paid-order-delivery-incident-report.html
- BillingWebhookKit standalone refund rollback report generator: https://qihaze123.github.io/billing-webhook-kit/tools/lemon-squeezy-refund-rollback-report.html
- BillingWebhookKit standalone delivery email template generator: https://qihaze123.github.io/billing-webhook-kit/tools/lemon-squeezy-delivery-email-template-generator.html
- BillingWebhookKit standalone Lemon Squeezy webhook event coverage matrix: https://qihaze123.github.io/billing-webhook-kit/tools/lemon-squeezy-webhook-event-coverage-matrix.html
- BillingWebhookKit standalone launch readiness scorecard: https://qihaze123.github.io/billing-webhook-kit/tools/billing-webhook-launch-readiness-scorecard.html
- BillingWebhookKit standalone debug cost calculator: https://qihaze123.github.io/billing-webhook-kit/tools/billing-webhook-debug-cost-calculator.html
- BillingWebhookKit standalone checkout provider decision matrix: https://qihaze123.github.io/billing-webhook-kit/tools/checkout-provider-decision-matrix.html
- BillingWebhookKit standalone Pro fit checker: https://qihaze123.github.io/billing-webhook-kit/tools/billing-webhook-pro-fit-checker.html
- BillingWebhookKit standalone payload generator: https://qihaze123.github.io/billing-webhook-kit/tools/lemon-squeezy-webhook-payload-generator.html
- BillingWebhookKit standalone x-signature verifier: https://qihaze123.github.io/billing-webhook-kit/tools/lemon-squeezy-signature-verifier.html
- BillingWebhookKit standalone signature mismatch debugger: https://qihaze123.github.io/billing-webhook-kit/tools/webhook-signature-mismatch-debugger.html
- BillingWebhookKit standalone idempotency key generator: https://qihaze123.github.io/billing-webhook-kit/tools/webhook-idempotency-key-generator.html
- BillingWebhookKit standalone Stripe fixture generator: https://qihaze123.github.io/billing-webhook-kit/tools/stripe-webhook-fixture-generator.html
- BillingWebhookKit standalone replay cURL generator: https://qihaze123.github.io/billing-webhook-kit/tools/webhook-replay-curl-generator.html
- BillingWebhookKit standalone Next.js handler generator: https://qihaze123.github.io/billing-webhook-kit/tools/nextjs-webhook-handler-generator.html
- BillingWebhookKit standalone Next.js Lemon Squeezy raw body audit: https://qihaze123.github.io/billing-webhook-kit/tools/nextjs-lemon-squeezy-raw-body-audit.html
- BillingWebhookKit standalone Vercel Lemon Squeezy webhook debugger: https://qihaze123.github.io/billing-webhook-kit/tools/vercel-lemon-squeezy-webhook-debugger.html
- BillingWebhookKit standalone payment webhook test plan generator: https://qihaze123.github.io/billing-webhook-kit/tools/payment-webhook-test-plan-generator.html
- BillingWebhookKit Next.js webhook 405 Lemon Squeezy fix: https://qihaze123.github.io/billing-webhook-kit/guides/nextjs-webhook-405-lemon-squeezy.html
- BillingWebhookKit Lemon Squeezy webhook 500 Vercel fix: https://qihaze123.github.io/billing-webhook-kit/guides/lemon-squeezy-webhook-500-vercel-nextjs.html
- BillingWebhookKit Lemon Squeezy webhook retry idempotency guide: https://qihaze123.github.io/billing-webhook-kit/guides/lemon-squeezy-webhook-retry-idempotency.html
- BillingWebhookKit payment webhook test tool alternatives: https://qihaze123.github.io/billing-webhook-kit/guides/payment-webhook-test-tool-alternatives.html
- BillingWebhookKit standalone entitlement decision matrix: https://qihaze123.github.io/billing-webhook-kit/tools/webhook-entitlement-decision-matrix.html
- BillingWebhookKit guide index: https://qihaze123.github.io/billing-webhook-kit/guides/
- BillingWebhookKit free sample: https://qihaze123.github.io/billing-webhook-kit/free-sample.html
- BillingWebhookKit free sample release: https://github.com/qihaze123/billing-webhook-kit/releases/tag/v0.1.0
- Lemon Squeezy webhook test: https://qihaze123.github.io/billing-webhook-kit/guides/lemon-squeezy-webhook-test.html
- Lemon Squeezy signature verification: https://qihaze123.github.io/billing-webhook-kit/guides/lemon-squeezy-webhook-signature.html
- Lemon Squeezy webhook test checklist: https://qihaze123.github.io/billing-webhook-kit/guides/lemon-squeezy-webhook-test-checklist.html
- Lemon Squeezy webhook raw body in Next.js: https://qihaze123.github.io/billing-webhook-kit/guides/lemon-squeezy-webhook-raw-body-nextjs.html
- Invalid Lemon Squeezy x-signature debugger: https://qihaze123.github.io/billing-webhook-kit/guides/lemon-squeezy-x-signature-invalid.html
- Lemon Squeezy order_created webhook fixture: https://qihaze123.github.io/billing-webhook-kit/guides/lemon-squeezy-order-created-fixture.html
- Lemon Squeezy checkout smoke test: https://qihaze123.github.io/billing-webhook-kit/guides/lemon-squeezy-checkout-smoke-test.html
- Lemon Squeezy checkout 404 custom price and currency mismatch: https://qihaze123.github.io/billing-webhook-kit/guides/lemon-squeezy-checkout-404-custom-price-currency.html
- Lemon Squeezy PayPal checkout webhook test: https://qihaze123.github.io/billing-webhook-kit/guides/lemon-squeezy-paypal-checkout-webhook-test.html
- Lemon Squeezy production checkout go-live checklist: https://qihaze123.github.io/billing-webhook-kit/guides/lemon-squeezy-production-checkout-go-live.html
- Lemon Squeezy production webhook troubleshooting checklist: https://qihaze123.github.io/billing-webhook-kit/guides/lemon-squeezy-production-webhook-troubleshooting.html
- Next.js webhook 405 Lemon Squeezy fix: https://qihaze123.github.io/billing-webhook-kit/guides/nextjs-webhook-405-lemon-squeezy.html
- Lemon Squeezy webhook 500 Vercel fix: https://qihaze123.github.io/billing-webhook-kit/guides/lemon-squeezy-webhook-500-vercel-nextjs.html
- Lemon Squeezy webhook retry idempotency guide: https://qihaze123.github.io/billing-webhook-kit/guides/lemon-squeezy-webhook-retry-idempotency.html
- Payment webhook test tool alternatives: https://qihaze123.github.io/billing-webhook-kit/guides/payment-webhook-test-tool-alternatives.html
- Lemon Squeezy webhook not firing after checkout: https://qihaze123.github.io/billing-webhook-kit/guides/lemon-squeezy-webhook-not-firing-after-checkout.html
- Lemon Squeezy digital download fulfillment: https://qihaze123.github.io/billing-webhook-kit/guides/lemon-squeezy-digital-download-fulfillment.html
- Lemon Squeezy checkout paid but no download: https://qihaze123.github.io/billing-webhook-kit/guides/lemon-squeezy-checkout-paid-but-no-download.html
- Lemon Squeezy download email not received: https://qihaze123.github.io/billing-webhook-kit/guides/lemon-squeezy-download-email-not-received.html
- Webhook signature mismatch debugger: https://qihaze123.github.io/billing-webhook-kit/guides/webhook-signature-mismatch-debugger.html
- Stripe webhook signature verification in Next.js: https://qihaze123.github.io/billing-webhook-kit/guides/stripe-webhook-signature-verification-nextjs.html
- Stripe webhook test plan for Next.js: https://qihaze123.github.io/billing-webhook-kit/guides/stripe-webhook-test-plan-nextjs.html
- Paddle webhook signature verification in Next.js: https://qihaze123.github.io/billing-webhook-kit/guides/paddle-webhook-signature-verification-nextjs.html
- Next.js Paddle webhook handler: https://qihaze123.github.io/billing-webhook-kit/guides/nextjs-paddle-webhook-handler.html
- Next.js payment webhook entitlement test matrix: https://qihaze123.github.io/billing-webhook-kit/guides/nextjs-payment-webhook-entitlement-test-matrix.html
- Next.js payment webhook refund rollback test: https://qihaze123.github.io/billing-webhook-kit/guides/nextjs-payment-webhook-refund-rollback-test.html
- Stripe refund webhook rollback in Next.js: https://qihaze123.github.io/billing-webhook-kit/guides/stripe-refund-webhook-rollback-nextjs.html
- Stripe subscription cancellation webhook in Next.js: https://qihaze123.github.io/billing-webhook-kit/guides/stripe-subscription-cancellation-webhook-nextjs.html
- Stripe invoice.paid webhook in Next.js: https://qihaze123.github.io/billing-webhook-kit/guides/stripe-invoice-paid-webhook-nextjs.html
- Stripe invoice.payment_failed webhook in Next.js: https://qihaze123.github.io/billing-webhook-kit/guides/stripe-invoice-payment-failed-webhook-nextjs.html
- Stripe webhook order of events in Next.js: https://qihaze123.github.io/billing-webhook-kit/guides/stripe-webhook-order-of-events-nextjs.html
- Paddle webhook test plan for Next.js: https://qihaze123.github.io/billing-webhook-kit/guides/paddle-webhook-test-plan-nextjs.html
- Lemon Squeezy webhook idempotency: https://qihaze123.github.io/billing-webhook-kit/guides/lemon-squeezy-webhook-idempotency.html
- Webhook idempotency key generator: https://qihaze123.github.io/billing-webhook-kit/guides/webhook-idempotency-key-generator.html
- Payment webhook contract test generator: https://qihaze123.github.io/billing-webhook-kit/guides/payment-webhook-contract-test-generator.html
- Payment webhook CI tests: https://qihaze123.github.io/billing-webhook-kit/guides/payment-webhook-ci-tests.html
- Payment webhook audit log in Next.js: https://qihaze123.github.io/billing-webhook-kit/guides/payment-webhook-audit-log-nextjs.html
- Payment webhook dead letter queue in Next.js: https://qihaze123.github.io/billing-webhook-kit/guides/payment-webhook-dead-letter-queue-nextjs.html
- Replay-safe payment webhook fulfillment in Next.js: https://qihaze123.github.io/billing-webhook-kit/guides/payment-webhook-replay-safe-fulfillment-nextjs.html
- Billing webhook launch readiness checklist: https://qihaze123.github.io/billing-webhook-kit/guides/billing-webhook-launch-readiness-checklist.html
- Billing webhook cost calculator: https://qihaze123.github.io/billing-webhook-kit/guides/billing-webhook-cost-calculator.html
- AI SaaS billing webhook checklist: https://qihaze123.github.io/billing-webhook-kit/guides/ai-saas-billing-webhook-checklist.html
- Lemon Squeezy vs Stripe webhooks for AI SaaS: https://qihaze123.github.io/billing-webhook-kit/guides/lemon-squeezy-vs-stripe-webhooks-ai-saas.html
- BillingWebhookKit pricing ROI guide: https://qihaze123.github.io/billing-webhook-kit/guides/billing-webhook-kit-pricing-roi.html
- BillingWebhookKit buyer checklist: https://qihaze123.github.io/billing-webhook-kit/guides/billing-webhook-kit-buyer-checklist.html
- Webhook entitlement decision matrix: https://qihaze123.github.io/billing-webhook-kit/guides/webhook-entitlement-decision-matrix.html
- Webhook idempotency checklist: https://qihaze123.github.io/billing-webhook-kit/guides/webhook-idempotency-checklist.html
- Webhook duplicate replay test: https://qihaze123.github.io/billing-webhook-kit/guides/webhook-duplicate-replay-test.html
- Webhook review checklist: https://qihaze123.github.io/billing-webhook-kit/guides/webhook-review-checklist.html
- SaaS billing webhook test plan: https://qihaze123.github.io/billing-webhook-kit/guides/saas-billing-webhook-test-plan.html
- Lemon Squeezy webhook fixtures: https://qihaze123.github.io/billing-webhook-kit/guides/lemon-squeezy-webhook-fixtures.html
- Payment webhook test generator: https://qihaze123.github.io/billing-webhook-kit/guides/payment-webhook-test-generator.html
- Billing webhook starter kit: https://qihaze123.github.io/billing-webhook-kit/guides/billing-webhook-starter-kit.html
- Next.js billing webhook test suite: https://qihaze123.github.io/billing-webhook-kit/guides/nextjs-billing-webhook-test-suite.html
- SaaS webhook release checklist: https://qihaze123.github.io/billing-webhook-kit/guides/saas-webhook-release-checklist.html
- Lemon Squeezy refund webhook test: https://qihaze123.github.io/billing-webhook-kit/guides/lemon-squeezy-refund-webhook-test.html

## Pro Kit

Buyer checklist: https://qihaze123.github.io/billing-webhook-kit/guides/billing-webhook-kit-buyer-checklist.html explains when to use the free tools, when the CN¥69 Pro Kit is reasonable, what public artifacts to inspect, and what the kit does not replace.

BillingWebhookKit Pro is a CN¥69 digital download planned for developers who want copy-ready fixtures, route handlers, signature tests, contract tests, duplicate replay tests, GitHub Actions checks, webhook review report templates, idempotency runbooks, and integration checklists. The Pro sample report previews the kind of PR-ready webhook evidence the paid pack is designed to produce: raw-body signature checks, duplicate replay evidence, entitlement decisions, CI coverage, launch notes, and secret-free buyer safeguards. The launch evidence pack ties the buying path together with checkout smoke evidence, PayPal live checkout evidence, production checkout readiness, event coverage, fulfillment proof, refund rollback, delivery email templates, the free sample, and the Pro Kit preview. The public manifest lists the paid package structure, test count, file count, and checksum without exposing the paid zip. The delivery, refund, and support page explains private ZIP delivery, checksum verification, support scope, duplicate-purchase handling, broken-archive handling, and safe issue reporting without production secrets. The Lemon Squeezy production checkout go-live checklist explains when a private production checkout can become a public buy link, including live config, CN¥69 pricing, PayPal checkout, signed paid webhooks, duplicate replay, private delivery, refund rollback, and support evidence. The Lemon Squeezy digital download fulfillment guide explains how to deliver a private ZIP, license file, or digital product after checkout using signed webhook verification, paid-state checks, idempotency, checksum evidence, and duplicate replay safety. The Lemon Squeezy refund webhook test guide explains signed refund event verification, entitlement rollback, duplicate replay safety, buyer support evidence, and secret-free refund reports before launch. The public status page summarizes checkout readiness, Pro Kit manifest verification, free sample checksum, XML sitemap, HTML sitemap, Search Console handoff, and health workflow links. The Search Console sitemap submission handoff page records the exact URL-prefix property, sitemap path, live crawl files, and owner-only submission boundary for Google Search Console. The HTML sitemap gives crawlers and users a single crawlable page linking the buyer path, standalone tools, and all guide pages. The tool index is a browser-only entry point with a launch lane for the launch evidence pack, PayPal live checkout report, production checkout readiness report, checkout smoke test report, fulfillment checklist generator, refund rollback report generator, delivery email template generator, Lemon Squeezy webhook event coverage matrix, payment webhook test plan generator, launch readiness scorecard, Pro fit checker, debug cost calculator, standalone payload generator, signature verifier, signature mismatch debugger, idempotency key generator, Stripe fixture generator, replay cURL generator, Next.js handler generator, entitlement decision matrix generator, full workbench, free sample, and Pro Kit preview. The standalone payment webhook test plan generator creates PR-ready Markdown launch plans for Lemon Squeezy, Stripe, Paddle, and Polar with raw-body signature verification, contract fields, idempotency, duplicate replay, entitlement decisions, checkout smoke, fulfillment, refund rollback, and CI gates. The standalone Pro fit checker scores checkout stage, provider coverage, manual setup hours, and webhook launch risks to recommend the free path, missing evidence, or when the CN¥69 Pro Kit is a reasonable shortcut. The standalone PayPal live checkout report creates a PR-ready report for PayPal visibility, CN¥69 price, paid webhook delivery, x-signature verification, duplicate replay, private delivery, refund rollback, support evidence, and owner approval. The standalone production checkout readiness report creates a PR-ready report for live key setup, published production variant, CN¥69 price, PayPal checkout, signed paid webhooks, duplicate replay, private delivery, refund rollback, support path, and secret-free release evidence. The standalone fulfillment checklist generator creates a PR-ready report for signed paid events, live variant checks, private ZIP or license delivery, idempotency, checksum evidence, support policy, and rollback notes. The standalone refund rollback report generator creates a PR-ready report for signed refund events, entitlement revocation, duplicate replay safety, support evidence, and secret-free release review. The standalone delivery email template generator creates buyer-facing delivery, resend, and support emails for private ZIP delivery, checksum evidence, refund policy links, safe issue reporting, and no secret leakage. The standalone Lemon Squeezy webhook event coverage matrix creates a release-ready event subscription and test matrix for order_created, subscriptions, payment success/failure, license keys, paid-state gates, x-signature verification, idempotency, duplicate replay, and live/test launch risk. The standalone payload generator is a browser-only page for generating fake Lemon Squeezy payloads, HMAC signatures, and cURL replay commands. The standalone x-signature verifier is a browser-only page for checking a Lemon Squeezy raw body and received signature without uploading secrets. The standalone signature mismatch debugger diagnoses raw-body mutation, header format, wrong secret, JSON reserialization, CRLF, and framework parser causes behind invalid signatures. The Lemon Squeezy checkout smoke test guide covers product price, checkout URL, paid order webhook delivery, duplicate replay, fulfillment, and release evidence before a buy link goes public. The Lemon Squeezy checkout 404 guide covers custom_price minor units, CN¥69 currency matching, published variants, and stale checkout URL checks before public launch. The Lemon Squeezy PayPal checkout webhook guide covers PayPal checkout visibility, paid order_created delivery, signature verification, duplicate replay, fulfillment evidence, and rollback notes. The Lemon Squeezy webhook not firing after checkout guide covers live/test mismatch, endpoint URLs, subscribed events, 2xx responses, signature failures, retries, and fulfillment checks. The standalone checkout smoke test report generator turns those gates into a PR-ready Markdown report with launch blockers and rollback notes. The standalone idempotency key generator builds provider-scoped keys, SQL constraints, handler guards, duplicate replay tests, and review notes for payment webhook retries. The standalone Stripe fixture generator creates fake Stripe event payloads, Stripe-Signature headers, cURL replay commands, and review notes without a Stripe account or API call. The Stripe Next.js signature guide targets raw-body verification, signed fixture regression tests, duplicate replay safety, and CI release gates for Stripe webhook routes. The Stripe webhook test plan for Next.js guide turns that into a launch checklist covering checkout.session.completed, invoice.paid, customer.subscription.deleted, charge.refunded, idempotency, entitlement decisions, checkout smoke evidence, and CI gates. The standalone replay cURL generator creates signed local replay commands for Lemon Squeezy, Stripe, Paddle, and Polar test payloads. The standalone Next.js handler generator creates App Router route handlers with raw-body signature verification, idempotency guard notes, env checklists, and replay tests. The standalone entitlement decision matrix generator maps payment webhook events to SaaS access grants, renewal extension, cancellation, failed-payment holds, and unknown-event quarantine rules. The standalone debug cost calculator estimates avoidable billing webhook debugging cost and compares it with a CNY 69 Pro Kit reference price. The standalone launch readiness scorecard scores production readiness and exports a PR-ready Markdown report. A public Site Health Check workflow monitors live page availability, sitemap coverage, Pro Kit buying signals, free-sample upgrade links, status page visibility, standalone tool visibility, HTML sitemap visibility, and checkout safety after deployments.
The Lemon Squeezy webhook troubleshooting hub is a search-oriented router for high-intent symptoms such as webhook not firing after checkout, Vercel 404, Next.js webhook 405, invalid x-signature, checkout 404 custom_price currency mismatch, PayPal live checkout checks, and production launch readiness.
The Next.js webhook 405 Lemon Squeezy guide targets Method Not Allowed failures with App Router POST export checks, deployed Vercel route smoke tests, middleware exclusions, raw-body x-signature verification, and duplicate replay evidence.
The Lemon Squeezy webhook 500 Vercel guide targets server crashes caused by missing env vars, raw-body x-signature failures, JSON parse errors, timingSafeEqual length errors, database or email side effects, and retry-unsafe fulfillment.
The Lemon Squeezy webhook retry idempotency guide targets duplicate order_created delivery, process-once fulfillment, 2xx/500 retry decisions, and replay evidence before checkout launch.
The payment webhook test tool alternatives guide compares webhook inboxes, provider CLIs, browser-only fixtures, CI contract tests, and the CN¥69 Pro Kit for small SaaS launch workflows.