This whitepaper explains why API security must span the full lifecycle, combining development-time controls, runtime protection, and a continuous feedback loop between security and engineering. While secure coding practices, scanning tools, and documentation analysis help reduce risk early, they cannot eliminate logic flaws, authorization weaknesses, or data exposures that only appear when APIs interact in production. Runtime security is essential because most API attacks target authenticated endpoints and rely on reconnaissance and business logic abuse that traditional tools cannot detect. The paper emphasizes continuous API discovery, behavioral analysis, and early attack detection in production, paired with actionable insights fed back to developers to remediate root causes. By linking

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