Verify before committing state
Place the server check before the protected action changes order or reservation state. Keep price calculation, inventory ownership, and payment authorization on the server.
USE CASE Checkout
Protect the action
that commits the cart.
Bring browser verification to order creation and reservation requests, alongside the controls your commerce application already owns.
- Checkout request
- MANDATEBrowser verification
- Payment + stock checks
- Stored order outcome
WHAT TO COVER
Put verification where the action happens.
A browser decision is not a payment decision
MANDATE provides evidence about a browser-originated request. It is not payment-fraud scoring, a chargeback guarantee, or a replacement for payment-provider controls.
Design for response loss
Customers refresh, networks drop, and payment providers send asynchronous updates. Use application-level idempotency and a stored operation result so a retry can recover an outcome without creating a duplicate order.
Separate callbacks from checkout
Payment webhooks and fulfillment jobs cannot complete browser verification. Keep them on independently authenticated paths, and observe the browser action before changing enforcement.
More use cases
Where else abuse has an impact.
INDUSTRIESE-commerceFocus browser verification on account entry, benefit claims, and checkout, while letting customers browse your catalog normally.Read more INDUSTRIESTicketingBring browser verification to reservation and purchase actions during high-demand releases, alongside your inventory and queue controls.Read more REQUEST INTEGRITYRetries, replay, and business outcomesRejecting reused proof and preventing a duplicate order solve different problems. A reliable action needs both boundaries to be clear.Read more