FusionAuth is a mobile app development platform that provides OAuth and OpenID Connect practices to improve user login experience, speed up development, and secure APIs. Implementing OAuth and OIDC in native mobile apps can be approached through either Native Login or Native Hybrid methods, which involve either customizing the login process or leveraging a third-party identity provider like Firebase. OAuth and OIDC standards-based approach centralizes ID concerns, offering a more scalable solution as the number of applications increases. The process involves authenticating users against a centralized identity provider, providing standard access tokens that apps can use to access APIs, and storing them securely to prevent interception. Single sign-on using Google/Apple SSO can be used instead of a private identity provider, while using the native system browser over webviews is recommended for increased security and enabling SSO across apps. By following these practices, native apps can build robust ID management systems that balance control and development speed.