This paper explains how government agencies rely on APIs to deliver essential public services and enable secure data sharing across departments, making API security and compliance central to public trust and operational efficiency. It outlines a complex compliance landscape that includes NIST SP 800-53, Government of Canada API Standards, ISO/IEC 27001 and 27017, and the MITRE ATT&CK framework, all of which shape expectations for secure, resilient APIs. Key security considerations include zero trust authentication, least-privilege access, encryption, input validation, continuous monitoring, and regular assessments. The paper emphasizes API posture governance as a way to continuously enforce standards, detect misconfigurations, manage risk, and demonstrate compliance while protecting sensit

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