Make sure payments actually work before you charge people - shippingszn launch readiness
If your app charges money, the payment flow is not 'done' when the checkout button opens. It is done when payment succeeds, your backend hears the signed webhook, paid access unlocks, the receipt lands, and cancellation/refund paths do not strand the user.
This is where AI-built apps embarrass themselves fast. A team launches, someone pays, the success page lies, the webhook never arrives, and now the first customer is both confused and charged. Or worse: a user edits a client-side price and buys the expensive thing for $0. Payments need a real dry run before launch day.
The shippingszn CLI includes automated checks for this launch-readiness control.
The Launch Fix Kit keeps scan-specific findings, file and line evidence, AI-builder punch-list tasks, and verification steps tied to the paid report.
- Run a full test-mode checkout from a logged-out or brand-new account. Pay with the provider's test card and confirm the success page shows the right purchased thing.
- Verify paid access comes from your backend's recorded payment state, not from a success URL, localStorage flag, or client-side boolean.
- Open the provider dashboard and confirm the webhook endpoint is live, signing is verified in code, and the event was delivered successfully.
- Test the unhappy paths: failed card, duplicate click, refresh after checkout, refund, cancellation, expired subscription, and trying to access paid content before the webhook arrives.
- Send yourself the receipt or confirmation email and confirm it lands in the inbox with the right amount, product, support contact, and refund/cancel instructions.
Run the scanner | Unlock Launch Fix Kit
Canonical URL: https://shippingszn.com/i/payments/