How to find the cause of external API failures and fix them before integration reaches production

The article explores critical issues in external API integration, such as unexpected response codes, incorrect request handling, or data loss. The author emphasizes the importance of a proactive approach to testing and designing a protective layer between systems. The focus is on analyzing negative scenarios: what to do if a service returns a 500 instead of a 400, or if a response is successful but contains corrupted data. The article offers practical methods for designing robust integrations, starting with a deep analysis of potential failure points. This approach allows for identifying vulnerabilities during the development phase, preventing failures in the production environment. The material is useful for developers and architects looking to improve the fault tolerance of their systems when interacting with external services.