Begin with your application’s boundaries
Map the endpoints that touch accounts, access, and transactions. Understand which identities can perform which operations before deciding what to monitor.
Give authentication careful attention
Protect login and recovery flows against automated attempts. Review how the application identifies users and manages credentials; an API key alone may not represent a user’s identity.
Make investigation possible
Decide what your team needs to reconstruct an incident. Meaningful events and a clear review owner make signals more useful than collecting data without a purpose.
Further reading
This is an introductory overview, not a comprehensive security assessment. For deeper implementation guidance, see OWASP: API Broken Authentication.