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Stripe

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Backend Application & API

• Verify webhook handlers call constructEvent with the signing secret and reject unsigned or mis-signed payloads.
• Verify the webhook endpoint reads the raw body; a JSON body parser running first invalidates the signature.
• Verify the event timestamp is checked so an old captured payload cannot be replayed.
• Verify webhook handling is idempotent by event id — Stripe retries, and a duplicate must not fulfil an order twice.
• Verify the handler responds quickly and does the work asynchronously, rather than timing out and being retried.
• Verify a failed webhook is visible to you, not only in Stripe's dashboard.

Business Logic & Race Conditions

• Verify the charge amount is computed server-side from a price or product id, never taken from the request body.
• Verify currency is server-side too; a client-supplied currency is a discount.
• Verify entitlement is granted from the webhook or a server-side retrieve, not from the browser returning to a success URL.
• Verify a success redirect cannot be visited directly to unlock the product.
• Verify idempotency keys are sent on charge and payment-intent creation so a retried request does not double-charge.
• Verify subscription state is read from Stripe or from a webhook-updated record, rather than assumed after checkout.
• Verify refunds, disputes, cancellations and failed renewals revoke access.
• Verify promotion codes and trials cannot be stacked or reused beyond intent.

Secrets Management & Cryptography

• Verify the secret key is server-side only, and that only the publishable key reaches the browser.
• Verify test and live keys cannot be confused — different environments, and an assertion at boot that the mode matches the environment.
• Verify restricted keys are used where a service needs only part of the API.
• Verify the webhook signing secret is stored as a secret and differs per endpoint and per environment.

Pre-Release Gates

• Verify card details never touch your server — Elements or Checkout, so PCI scope stays SAQ-A.
• Verify a real payment has been made and refunded end to end in production before launch.