> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.littglobal.com/litt-white-label/api-reference/authentication/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.littglobal.com/_mcp/server.

# Authentication


## API Docs

- Authentication [Challenge](https://docs.littglobal.com/litt-white-label/api-reference/authentication/challenge.md)
- Authentication [Challenge Captcha](https://docs.littglobal.com/litt-white-label/api-reference/authentication/challenge-captcha.md)
- Authentication [Challenge Response](https://docs.littglobal.com/litt-white-label/api-reference/authentication/challenge-response.md)
- Authentication [Resend Username - SMS](https://docs.littglobal.com/litt-white-label/api-reference/authentication/resend-username-sms.md)
- Authentication [Request Mobile Number Verification](https://docs.littglobal.com/litt-white-label/api-reference/authentication/request-mobile-number-verification.md)
- Authentication [Sign Up](https://docs.littglobal.com/litt-white-label/api-reference/authentication/sign-up.md)
- Authentication [Sign In](https://docs.littglobal.com/litt-white-label/api-reference/authentication/sign-in.md)
- Authentication [Sign Out](https://docs.littglobal.com/litt-white-label/api-reference/authentication/sign-out.md)
- Authentication [Verify Mobile Number](https://docs.littglobal.com/litt-white-label/api-reference/authentication/verify-mobile-number.md)

## OpenAPI Specification

The raw OpenAPI 3.1 specification for this API is available at:
- [OpenAPI JSON](https://docs.littglobal.com/openapi.json)
- [OpenAPI YAML](https://docs.littglobal.com/openapi.yaml)