# SDK / API Guides

- [SDK Implementation Recipes & Patterns](https://docs.humanity.org/developer-guides-and-tutorials/sdk-api-guides/sdk-implementation-recipes-and-patterns.md): Prerequisites, common integration patterns and best practices for SDK usage.
- [Frontend OAuth with the Connect SDK](https://docs.humanity.org/developer-guides-and-tutorials/sdk-api-guides/frontend-oauth-with-the-connect-sdk.md): Build a React app that authenticates users with Humanity's OAuth flow and gates content based on biometric verification — using the Connect SDK directly without pre-built components.
- [Personalized Newsletter App - Reference Implementation](https://docs.humanity.org/developer-guides-and-tutorials/sdk-api-guides/personalized-newsletter-app-reference-implementation.md): Full-stack reference application demonstrating Humanity SDK integration with user authentication, email verification, and personalized content delivery.
- [Personalized Newsletter App Overview](https://docs.humanity.org/developer-guides-and-tutorials/sdk-api-guides/personalized-newsletter-app-reference-implementation/personalized-newsletter-app-overview.md): Complete architecture overview, repository links, high-level flow diagram, and prerequisites for the newsletter reference app.
- [Installing the App](https://docs.humanity.org/developer-guides-and-tutorials/sdk-api-guides/personalized-newsletter-app-reference-implementation/installing-the-app.md): Step-by-step installation guide: clone repository, configure environment variables, install dependencies, set up OAuth credentials, and run locally.
- [Understanding the SDK Usage](https://docs.humanity.org/developer-guides-and-tutorials/sdk-api-guides/personalized-newsletter-app-reference-implementation/understanding-the-sdk-usage.md): Code walkthrough explaining SDK initialization, authentication flow, callback handling, user data retrieval, and error handling in the newsletter app.


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