The system re-validates everything server-side before charging you: you're logged in and own the cart, the cart isn't empty, delivery/pickup is valid for every date, you've agreed to the Terms & Conditions if the store requires it ("Force Agree on cart"), any catering event time requirements are met, all order minimums and time-slot caps still pass, and a payment method is selected if anything is owed after your Digital Balance is applied. If everything passes, your card is charged (or a 3D-Secure confirmation is requested if the store has that on), the order is saved, and you're taken to your order confirmation page.