> ## Documentation Index
> Fetch the complete documentation index at: https://devdocs.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.

<CardGroup cols={2}>
  <Card title="S2s call patterns" icon="folder-open" href="/services/xbox-services/fundamentals/s2s-auth-calls/s2s-calls/s2s-call-patterns/index">
    Documentation for s2s call patterns.
  </Card>

  <Card title="Service calls to XBOX services" icon="right-to-bracket" href="/services/xbox-services/fundamentals/s2s-auth-calls/s2s-calls/live-s2s-calls-nav">
    Information about authenticating through XBOX services.
  </Card>

  <Card title="Title service calls to XBOX services" icon="lightbulb" href="/services/xbox-services/fundamentals/s2s-auth-calls/s2s-calls/live-title-service-calls-xbox-live">
    This article describes how to call XBOX services from a custom title service using an XBOX Security Token (XSTS):
  </Card>
</CardGroup>

## See also

* [Custom service config](/services/xbox-services/fundamentals/s2s-auth-calls/custom-service-config/index)
* [Service authentication](/services/xbox-services/fundamentals/s2s-auth-calls/service-authentication/index)


## Related topics

- [S2s calls](/services/xbox-services/fundamentals/s2s-auth-calls/s2s-calls/index.md)
- [S2s auth calls](/services/xbox-services/fundamentals/s2s-auth-calls/index.md)
- [S2s call patterns](/services/xbox-services/fundamentals/s2s-auth-calls/s2s-calls/s2s-call-patterns/index.md)
- [Custom service config](/services/xbox-services/fundamentals/s2s-auth-calls/custom-service-config/index.md)
- [Service authentication](/services/xbox-services/fundamentals/s2s-auth-calls/service-authentication/index.md)