This guide presents APIs as the connective tissue of modern software and argues that their importance makes them one of the most exposed parts of the attack surface. It highlights common API risks such as broken authentication, weak or missing rate limiting, and improper data exposure, then argues that piecemeal defenses are not enough. The guide recommends a holistic model that protects APIs across the entire lifecycle: SAST to secure API code at the source, DAST to validate runtime behavior in live environments, and API-specific testing for controls like authentication, encryption, scraping resistance, and monitoring. It concludes that the strongest approach is a unified one, where SAST, DAST, and API-aware testing work together to reduce silos, catch issues earlier, improve trust, stren

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