n API penetration test is a security assessment that focuses on identifying vulnerabilities in application programming interfaces (APIs), which are critical for enabling communication between systems and services. The test evaluates how securely APIs handle authentication, authorisation, data validation, and error handling. It also checks for common vulnerabilities such as broken authentication, excessive data exposure, injection flaws, and improper rate limiting. The aim is to uncover weaknesses that could allow unauthorised access, data leakage, or exploitation. Conducting an API penetration test helps organisations ensure that their APIs are resilient, secure, and capable of protecting sensitive data from potential attacks.