Test a set of REST APIs and create a maintainable Postman collection for future regression checks. The work should cover valid requests, validation errors, authentication, permissions, boundary cases, and response consistency. We need clear evidence and prioritized findings rather than only a list of successful calls. The successful freelancer will be expected to work independently, share progress at agreed checkpoints, and raise questions early when a requirement needs clarification. All submitted work should be original, well organized, and ready for practical use after reasonable review.