During June 2025, Twango Dev developed and integrated a Postman API Testing Collection for the twangodev/uw-coursemap repository. By authoring and committing a new JSON-based Postman collection, Twango Dev enabled standardized, repeatable API tests that streamline both local development and pull request reviews. This approach leveraged API Testing and Postman skills to automate endpoint validation, reducing manual testing effort and minimizing the risk of regressions. The work improved developer onboarding by providing ready-to-run scripts, ensuring consistent API behavior before integration. While the contribution focused on a single feature, it addressed a core need for reliable, automated API interaction and validation.