# Guides

- [CORS, CSP and Preview API](/qapi/guides/cors-csp-and-preview-api.md): This page highlights the common reasons why your preview API response may fail and what you can do to ensure your APIs are accessible to preview.
- [Introduction to API Testing](/qapi/guides/introduction-to-api-testing.md)
- [Getting Started with API Testing](/qapi/guides/getting-started-with-api-testing.md)
- [Key Screens](/qapi/guides/key-screens.md): Guide to key screens in the API Testing flow.
- [Guide to JSON in API Testing](/qapi/guides/guide-to-json-in-api-testing.md)