A complete API penetration test should cover discovery, authentication, authorization across every role and tenant, data exposure, injection, abuse and rate limiting, business logic, and configuration, backed by reproducible evidence and a defined retest. The checklist below is written as buyer requirements: statements a security team can check a vendor's proposal or final report against, not instructions for performing the test yourself.

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Enterprise web application penetration testing typically runs on a multi-week cycle covering scoping, testing, reporting, and retest. Cost is driven mainly by application complexity and user role count, not page count or site size. The most common scoping mistake enterprises make is under-counting authenticated user roles, which quietly expands the actual testing effort well beyond what the initial scope assumed.

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API penetration testing focuses on authorization, authentication, and business logic at the endpoint level rather than the page-based structure a web application test targets. Scope is defined by endpoints, roles, and protocols rather than pages, and the most common finding class across enterprise APIs is broken object-level authorization. A test that only covers documented endpoints leaves the least-tested part of most API estates untouched. Documentation is where every API test starts; pairing testing with attack surface discovery is how you find the APIs nobody documented.

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