Razorpay caters to millions of API requests every day that are non-uniform in nature. As a key provider of financial infrastructure in India, it is important to ensure availability of services round the clock. Further, it is also vital to ensure seamless and robust authentication and authorization, due to the involvement of financial data. This case study focuses on how we solved the availability and authorization challenges using Edge - our API gateway, AWS Cloudfront, and ALB. It will also include insights on how our rate limiter plugin handles more than 200K RPS workloads seamlessly, and how our authorization plugin enforces policies at this scale at 5-8millisec latencies. Key learnings include Edge architecture, how we rate limit requests on a granular level, and ensuring authorization is not impacted.