Billing webhook starter kit
Most billing bugs come from missing structure: fixtures in one place, handlers elsewhere, and no release gate around entitlement changes.
Open the free generatorKeep provider code explicit
Separate Lemon Squeezy, Stripe, Paddle, and Polar verification code so each provider's signing rules stay clear.
Test entitlement side effects
Assert that paid orders grant access once, cancellations remove or downgrade access, and renewals extend the correct account.
Ship a CI release gate
Run signature, parsing, replay, and idempotency tests before every deployment that touches billing code.
FAQ
What should a billing starter kit include?
At minimum: fixtures, raw-body route handlers, signature helpers, idempotency tests, provider mapping examples, and CI commands.
Is this only for Lemon Squeezy?
The free generator focuses on Lemon Squeezy, while the Pro Kit is structured for multi-provider billing tests.
Use the free sample before wiring production checkout
Download a public sample pack with fake Lemon Squeezy fixtures, signature tests, contract checks, duplicate replay tests, and CI skeletons. The Pro Kit preview shows the full paid package structure without exposing the private archive.