Uptime monitors say your store answers. They do not say a customer can buy. MageSentinel opens a real browser, adds a product to the cart, goes through shipping and payment, and checks each result: the right price, shipping methods offered, totals that add up, a payment method ready. When something breaks it alerts you to the failing step with a screenshot and a trace. Nothing to install for monitoring; works with Magento 2 (Luma, Hyvä Checkout and one-step checkouts) and WooCommerce.
