Checkout broke during a sale, can you fix it while traffic is high?
Yes, this is our top-priority queue, because every minute costs orders. We stabilise first (get checkout working again) and root-cause second. Common culprits: a payment gateway declining valid cards, a Magento place-order stuck on “Something went wrong”, cart AJAX returning 500, or PHP-FPM workers maxed out under load. See the dedicated Magento checkout bug fixing page for the deeper checkout playbook.