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An Ecommerce application was facing intermittent payment failures during peak traffic hours. The platform has reported cases where the payment page shows failure. The issue occurs when it is peak time. You are assigned to trace the flow, identify where the issue occurs and apply safe fix. You are asked to analyze issue, propose targeted architectural improvements and justify design tradeoffs.

You are working at a food delivery platform (like Swiggy/Zomato). The company wants to increase order conversion rate without hurting margins. Currently: coupons are shown randomly or uniformly, many users ignore them, and some users overuse discounts leading to revenue loss.