In e-commerce operations, the checkout flow's reliability is critical to preserving revenue. Even small, unnoticed errors can negatively impact conversion rates and revenue. Daily testing of the checkout process proactively identifies and addresses these issues before they manifest into larger problems. For example, an intermittent failure of the 'Proceed to Payment' button affecting just 5% of transactions could compound into hundreds of lost sales over time. The lack of a rigorous testing routine risks silently undermining customer experience and operational efficiency. Establishing a preventive operating model involves implementing a robust QA protocol to consistently monitor and refine the checkout process, effectively sealing potential sales leaks and minimizing cart abandonment rates.