When making API calls to different providers, developers often encounter a range of response codes that indicate the success or failure of their requests. Understanding these codes is crucial for effective API call management, as they provide context on issues and enable debugging. Common response codes include 200 OK, indicating a successful request, 201 Created, signifying the creation of a new resource, and error codes such as 404 Not Found, 429 Too Many Requests, 401 Unauthorized, 500 Internal Server Error, and 503 Service Unavailable, each requiring specific troubleshooting strategies. By recognizing and responding to these codes, developers can optimize their API calls, manage rate limits, and handle server issues, ultimately improving the overall integration experience. Merge's Unified API and Integration Observability tooling can also help streamline this process by providing a single build for hundreds of integrations and enabling easy identification and resolution of integration issues.