> ## Documentation Index
> Fetch the complete documentation index at: https://docs.xbox.com/llms.txt
> Use this file to discover all available pages before exploring further.

# S2s calls

> Reference for making XBOX Live service-to-service REST calls from title services, including XSTS token acquisition and S2S calling patterns.

Explore s2s calls topics for XBOX game development.

> [card] [S2s call patterns](https://docs.xbox.com/services/xbox-services/fundamentals/s2s-auth-calls/s2s-calls/s2s-call-patterns/index.md)
>
> Documentation for s2s call patterns.

> [card] [Service calls to XBOX services](https://docs.xbox.com/services/xbox-services/fundamentals/s2s-auth-calls/s2s-calls/live-s2s-calls-nav.md)
>
> Information about authenticating through XBOX services.

> [card] [Title service calls to XBOX services](https://docs.xbox.com/services/xbox-services/fundamentals/s2s-auth-calls/s2s-calls/live-title-service-calls-xbox-live.md)
>
> This article describes how to call XBOX services from a custom title service using an XBOX Security Token (XSTS):

## See also

* [Custom service config](https://docs.xbox.com/services/xbox-services/fundamentals/s2s-auth-calls/custom-service-config/index.md)
* [Service authentication](https://docs.xbox.com/services/xbox-services/fundamentals/s2s-auth-calls/service-authentication/index.md)


## Related topics

- [S2s auth calls](https://docs.xbox.com/services/xbox-services/fundamentals/s2s-auth-calls/index.md)
- [S2s call patterns](https://docs.xbox.com/services/xbox-services/fundamentals/s2s-auth-calls/s2s-calls/s2s-call-patterns/index.md)
- [Custom service config](https://docs.xbox.com/services/xbox-services/fundamentals/s2s-auth-calls/custom-service-config/index.md)
- [Service authentication](https://docs.xbox.com/services/xbox-services/fundamentals/s2s-auth-calls/service-authentication/index.md)
- [Authentication and S2S (contents)](https://docs.xbox.com/services/xbox-services/fundamentals/s2s-auth-calls/live-s2s-auth-calls-nav.md)