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

# Affiliate APIs

> Server-to-server APIs for affiliate partners

Use these APIs to send Linkrunner traffic from your server instead of through a tracking link. They need no API key: the advertiser's app ID or link domain, plus your campaign code, identify the traffic.

<CardGroup cols={2}>
  <Card title="S2S Click API" icon="server" href="/api-reference/s2s-clicks">
    Report a click from your server when the user goes straight to the store. Accepts AppsFlyer parameter names.
  </Card>

  <Card title="S2S Impression API" icon="eye" href="/api-reference/s2s-impressions">
    Report an ad impression so an install without a click can be credited to your view.
  </Card>
</CardGroup>

For setup steps and how attribution works, start with the guides: [Server-to-Server Clicks](/affiliate-partners/s2s-clicks) and [Server-to-Server Impressions](/affiliate-partners/s2s-impressions).

**Need help?** Contact [support@linkrunner.io](mailto:support@linkrunner.io)