This document discusses developing reusable security APIs to improve application security. It proposes APIs for authentication, cryptography, and preventing cross-site request forgery (CSRF) attacks. The APIs should make security easier for developers and be designed based on developer needs and feedback. Maintaining the APIs involves refactoring for extensibility, using semantic versioning, and quickly addressing issues and requests from developers using the APIs. The goal is to create APIs that developers want to use by simplifying integration and security tasks.