What are some scenarios where a third-party API dependency failing can cause my API to return a 500 error that I can test with Postman?

If your API relies on external services (e.g., a payment gateway, a social media API) and those services are unavailable or return an error, your API might return a 500 error if it doesn't handle the failure gracefully. You can use a tool like WireMock to simulate the failure of the external service. Configure WireMock to return an error response (e.g., a 503 Service Unavailable or a 500 Internal Server Error) when your API tries to call it. Then, use Postman to trigger the API call and observe the 500 error.