API Integration Testing

My project already consumes a REST API, and I now need a systematic round of integration testing to make sure every call behaves as intended across environments. Please design and run tests that validate request/response structure, error handling and edge-case behaviour. I expect a concise test plan up front, followed by reproducible test cases, clear pass/fail results and a short summary of any defects you uncover. Tools such as Postman, Insomnia, curl or automated scripts (e.g. in Jest, Mocha, PyTest, or similar) are welcome as long as the final artefacts can be rerun on my side.

Deliverables :
• Test plan outlining scenarios and expected outcomes
• Executable test scripts or collection files
• Result log and defect report with steps to reproduce

All endpoints, sample credentials and environment details will be provided as soon as the engagement starts, so you can dive straight into the API integration work.