Tool Index
Payment webhook tools for the work before checkout goes live.
Browser-only utilities for generating fake Lemon Squeezy and Stripe fixtures, producing PayPal live checkout reports, planning production checkout readiness, mapping webhook event coverage, checking HMAC signatures, debugging signature mismatches, producing checkout smoke test reports, deriving idempotency keys, mapping entitlement decisions, calculating debugging cost, replaying webhook requests, assembling launch evidence, checking Pro Kit fit, and deciding whether the Pro Kit is worth buying.
Billing webhook launch evidence pack
Follow one purchase-adjacent path through checkout smoke, event coverage, fulfillment proof, refund rollback, delivery email, free sample, and CN¥69 Pro Kit review.
Open evidence pack PayPal live checkoutLemon Squeezy PayPal live checkout report
Generate a secret-free report for PayPal visibility, CN¥69 price, paid webhook delivery, signature verification, duplicate replay, private delivery, refund rollback, support, and owner approval.
Open PayPal report Production gateLemon Squeezy production checkout readiness report
Generate a secret-free go-live report for live key setup, published variant, CN¥69 price, PayPal checkout, signed paid webhooks, duplicate replay, private delivery, refund rollback, support, and release evidence.
Open readiness report Live commandLemon Squeezy live checkout launch command builder
Generate a secret-safe production launch command for CN¥69 price, live store ID, variant ID, publish confirmation, GitHub Pages deployment, and revenue verification.
Build launch command Launch laneLemon Squeezy checkout smoke test report
Start here when the buy link is close. Generate a release-ready report for CN¥69 price visibility, checkout URL, paid webhook delivery, signature gate, duplicate replay, fulfillment evidence, and rollback notes.
Open smoke report Endpoint smokeLemon Squeezy webhook endpoint smoke test
Generate a secret-free endpoint report for webhook URL, POST method, live/test alignment, subscribed events, 2xx response, x-signature checks, retries, and routing.
Open endpoint test Mode mismatchLemon Squeezy live/test mode checker
Generate a secret-free alignment report for checkout links, variants, stores, webhook endpoints, signing secrets, order payloads, and fulfillment routes.
Open mode checker Delivery proofLemon Squeezy fulfillment checklist generator
Prove what happens after payment: signed paid event, live variant match, private ZIP or license delivery, idempotency guard, checksum evidence, support policy, and rollback notes.
Open fulfillment report No-download incidentLemon Squeezy paid order delivery incident report
Generate a secret-free incident report for paid checkout, order_created delivery, variant mapping, fulfillment status, private resend, checksum evidence, and refund boundaries.
Open incident report Refund rollbackLemon Squeezy refund rollback report
Generate a PR-ready refund evidence report for signed refund events, entitlement rollback, duplicate replay safety, support notes, and secret-free release review.
Open refund report Event coverageLemon Squeezy webhook event coverage matrix
Choose the Lemon Squeezy events your billing route must subscribe to for digital downloads, subscriptions, license keys, signed verification, idempotency, and duplicate replay tests.
Open event matrix Vercel debugVercel Lemon Squeezy webhook debugger
Turn Vercel 404, 405, 500, missing order_created, and invalid x-signature symptoms into a PR-ready Next.js launch report without uploading logs or secrets.
Open Vercel debugger Search routerLemon Squeezy webhook troubleshooting hub
Jump from webhook not firing, Vercel 404, Next.js 405, x-signature invalid, checkout 404, PayPal live checks, and production launch symptoms to the right tool.
Pick troubleshooting path Buyer emailLemon Squeezy delivery email template generator
Draft buyer-facing delivery, resend, and support emails with private ZIP safety, checksum evidence, support policy links, refund boundaries, and no public secret leakage.
Open email templates Launch scoreBilling webhook launch readiness scorecard
Score raw-body signatures, idempotency, duplicate replay, fixtures, entitlement rules, env secrets, CI, monitoring, and checkout smoke evidence before real payments go live.
Open scorecard Test planPayment webhook test plan generator
Generate a PR-ready plan for provider events, raw-body signatures, trusted fields, idempotency, duplicate replay, entitlement decisions, checkout smoke tests, fulfillment, refunds, and CI.
Open test plan Buy decisionBilling webhook debug cost calculator
Estimate avoidable debugging exposure and compare it against the CNY 69 Pro Kit reference price before spending more time hand-assembling fixtures and review notes.
Open cost calculator Provider choiceCheckout provider decision matrix
Compare Lemon Squeezy, Stripe, Paddle, and Polar for an AI SaaS launch, then export a webhook test plan for signatures, idempotency, checkout smoke, fulfillment, and refunds.
Open provider matrix Pro fitBillingWebhookKit Pro fit checker
Score launch stage, provider coverage, manual setup time, and webhook risks to decide whether free tools are enough or the CN¥69 Pro Kit is reasonable.
Open fit checkerLemon Squeezy webhook payload generator
Generate fake `order_created`, subscription, cancellation, payment, and license payloads with local HMAC signatures and cURL replay commands.
Open payload generator Signature checkerLemon Squeezy x-signature verifier
Paste a raw body, endpoint signing secret, and received `x-signature` header to verify whether the digest matches locally.
Open verifier Mismatch debugWebhook signature mismatch debugger
Diagnose raw-body mutation, header format, wrong secret, JSON reserialization, CRLF, and framework parser causes behind invalid signatures.
Open mismatch debugger Retry safetyWebhook idempotency key generator
Build stable provider keys, SQL constraints, handler guards, duplicate replay tests, and review notes before payment side effects run.
Open idempotency tool Stripe fixturesStripe webhook fixture generator
Generate fake Stripe checkout, invoice, subscription, and payment intent payloads with local Stripe-Signature headers and cURL replay commands.
Open Stripe generator Replay commandsWebhook replay cURL generator
Generate replayable cURL commands and provider signature headers for Lemon Squeezy, Stripe, Paddle, and Polar webhook routes.
Open replay tool Route generatorNext.js webhook handler generator
Generate App Router handlers with raw-body signature checks, idempotency guard notes, env checklists, and duplicate replay tests.
Open Next.js generator Next.js raw bodyNext.js Lemon Squeezy raw body audit
Score a Next.js App Router Lemon Squeezy route for request.text(), x-signature verification, runtime choice, idempotency, replay tests, and PR evidence.
Open raw-body audit Vercel debugVercel Lemon Squeezy webhook debugger
Diagnose Vercel and Next.js Lemon Squeezy webhook launch failures: 404, 405, 500, missing delivery, raw body, env vars, and release evidence.
Open Vercel debugger Access rulesWebhook entitlement decision matrix
Generate provider-specific access decisions, persistent writes, and duplicate replay tests for SaaS billing events before checkout opens.
Open matrix generator Provider choiceCheckout provider decision matrix
Generate a local Lemon Squeezy vs Stripe vs Paddle vs Polar launch test plan for AI SaaS checkout decisions.
Open provider matrix Debug costBilling webhook debug cost calculator
Estimate raw-body, retry, idempotency, entitlement, and release-review debugging cost against a CNY 69 Pro Kit reference price.
Open cost calculator Pro fitBillingWebhookKit Pro fit checker
Generate a local recommendation for free tools, missing launch evidence, or the CN¥69 Pro Kit based on webhook launch risk.
Open fit checker Launch scoreBilling webhook launch readiness scorecard
Score raw-body signatures, idempotency, duplicate replay, fixtures, entitlement rules, env secrets, CI, and monitoring before real checkout.
Open scorecard Checkout proofLemon Squeezy checkout smoke test report
Generate a release-ready report for product price, checkout URL, paid webhook delivery, signature gate, duplicate replay, and fulfillment evidence.
Open smoke report PayPal live checkoutLemon Squeezy PayPal live checkout report
Generate a launch evidence report for PayPal visibility, CN¥69 price, paid webhooks, x-signature verification, duplicate replay, private fulfillment, and rollback.
Open PayPal report Production gateLemon Squeezy production checkout readiness report
Generate a PR-ready go-live report for live config, CN¥69 price, PayPal checkout, signed webhooks, duplicate replay, delivery, refund rollback, and support.
Open production report Live commandLemon Squeezy live checkout launch command builder
Generate the owner-only launch command with safe placeholders for live key, store ID, variant ID, CN¥69 price, publish confirmation, and revenue verification.
Build launch command Delivery proofLemon Squeezy fulfillment checklist generator
Generate a release-ready report for paid order fulfillment, private ZIP delivery, x-signature verification, idempotency, checksum evidence, and support policy links.
Open fulfillment report No-download incidentLemon Squeezy paid order delivery incident report
Generate secret-free Markdown evidence for paid orders where download delivery, private resend, checksum proof, or refund boundaries need review.
Open incident report Refund rollbackLemon Squeezy refund rollback report generator
Generate secret-free Markdown evidence for refund webhook signature gates, entitlement revocation, duplicate replay safety, and support review.
Open refund report Buyer emailLemon Squeezy delivery email template generator
Generate copy-ready delivery, resend, and support replies for paid Lemon Squeezy digital products without exposing private links, API keys, or customer data.
Open email templates Event coverageLemon Squeezy webhook event coverage matrix
Generate a release-ready event subscription matrix for order_created, subscriptions, license keys, paid-state checks, x-signature verification, and duplicate replay coverage.
Open event matrix Full workbenchBillingWebhookKit browser app
Use the larger workbench for fixtures, signature mismatch debugging, idempotency keys, contract tests, entitlement decisions, replay simulation, cost estimates, and review reports.
Open full appFrom tool to package
Use the tools first, then copy the tested structure when launch risk rises.
The public tools solve one-off verification jobs. The free sample shows the package format. The Pro Kit adds provider fixtures, route handlers, CI tests, review templates, and launch runbooks for teams preparing to accept real payments.