This whitepaper outlines the evolution of application security in the context of modern cloud-native architectures. It begins by contrasting traditional application architectures with modern microservices and API-based frameworks. The document explains how businesses have shifted towards cloud-native technologies, highlighting the significant components such as containerization, automation, and DevOps practices. It discusses the vulnerabilities that arise from these changes, emphasizing that security measures must adapt to protect against new attack vectors introduced by modern application designs. The paper also details the requirements for securing cloud-native applications, focusing on the importance of understanding application context at runtime to validate client requests. It emphasizes the need for robust security systems that can monitor and react to patterns of API requests to identify potential malicious activity. Overall, the whitepaper serves as a comprehensive guide to understanding the challenges and requirements for modern application security.