Browser-only tool

Checkout provider decision matrix for AI SaaS.

Compare Lemon Squeezy, Stripe, Paddle, and Polar through the lens that usually breaks at launch: webhook signatures, idempotency, paid-state mapping, checkout smoke evidence, private fulfillment, refunds, and production readiness. No account login, no API calls, no uploaded secrets.

Inputs

Describe the launch path

Product model Checkout priority Webhook stack

Launch risks

Refund or cancellation must revoke access. Paid users receive a private ZIP, license, or entitlement. Provider retries must not duplicate side effects. Billing route was AI-generated or heavily AI-edited.

Output

Provider fit and webhook test plan

Top pick -

Launch blocker -

Required tests -

Upgrade cue CN¥69 Pro Kit when manual setup is slower

Markdown report

Provider comparison guide Read the Lemon Squeezy vs Stripe webhook launch comparison for AI SaaS. Idempotency key generator Build stable keys and duplicate replay tests before writing billing side effects. Preview the CN¥69 Pro Kit Copy-ready fixtures, handlers, tests, CI notes, and review templates.