Checkout on my Prestashop store stalls right after the customer hits “Next” and never reaches the payment page. No error message appears; the button simply stops responding, so orders cannot be placed. I need the underlying cause diagnosed and resolved—whether the issue sits in core Prestashop code, a module conflict, the theme’s JavaScript, or a mis-configured cart rule. A clean, fully functional checkout flow that proceeds to the payment gateway is the required outcome, with no new errors introduced elsewhere in the shop. Please share relevant Prestashop experience when you reply, especially work where you fixed similar checkout or JavaScript issues. A short outline of the steps you expect to take and any modules you plan to inspect or disable temporarily will help me decide quickly. Deliverables • Working checkout that advances to the payment page and completes an order • Brief summary of the root cause and the fix applied (so future updates don’t break it again)