Comprehensive API Test Automation

I have a spreadsheet-driven workflow that talks to a custom business app through an HTTP API. To safeguard that link I want a fully automated test suite. The goal is simple: every change to either side should immediately be validated so I know the API still

• returns the exact data the spreadsheet expects
• responds with clear, correct error messages when something goes wrong
• stays fast and reliable even when hammered with a high volume of requests

You may build the suite in the toolset you are most comfortable with—Postman + Newman, REST-assured, pytest, JMeter, or a comparable framework—as long as the tests can run headless in our CI pipeline and output a concise report (JSON or HTML). The current API is REST/JSON with token-based auth; I will provide the spec and sample credentials.

Deliverables
1. Well-structured test scripts covering success, error, and load scenarios
2. A command-line runner or pipeline step that can be scheduled or triggered on commit
3. Clear documentation on setup, configuration, and how to add new tests

I can spin up a staging environment for you on day one, and I’m ready to review milestones as soon as basic smoke tests are in place. Let me know your estimated turnaround and which framework you’d prefer so we can get started.