This paper explains how technology and software companies depend on APIs to power modern applications, making API security essential to trust and reliability. It outlines a compliance landscape shaped by ISO/IEC 27001 and 27017 for information security management, GDPR requirements for protecting EU personal data, and the MITRE ATT&CK framework for understanding API-specific attack techniques. Key security considerations include secure API design, strong authentication and authorization, encryption, input validation, rate limiting, continuous monitoring, and regular vulnerability testing. The paper emphasizes API posture governance as a way to maintain visibility, automate policy enforcement, detect misconfigurations and threats, and continuously demonstrate compliance while protecting sen

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