How do I find and exploit an insecure API endpoint in a mobile app

Question

I’m testing the security of a mobile application and I suspect there’s an insecure API endpoint that could be exploited. I’ve managed to capture network traffic using tools like Burp Suite, but I’m not sure how to analyze the API requests and identify potential vulnerabilities, such as improper authentication or data leakage.

What’s the best approach to locating and testing insecure API endpoints in mobile apps? Are there any specific techniques or tools that can help with reverse engineering the API and exploiting weaknesses in the requests or responses?