# Events APIs (Server-to-Server & Client-to-Server)

**Canonical:** https://apis.io/apis/appsflyer/events-apis-server-to-server-client-to-server/  
**Provider:** AppsFlyer — https://apis.io/providers/appsflyer/  
**Base URL:** https://api3.appsflyer.com/  
**Documentation:** https://dev.appsflyer.com/hc/reference/api-reference-overview

Events APIs (Server-to-Server & Client-to-Server) is one of 11 APIs that [AppsFlyer](https://apis.io/providers/appsflyer/) publishes on the [APIs.io](https://apis.io/) network, described by a machine-readable OpenAPI specification. Tagged areas include Event, Server-to-Server, Ingestion, Engagement, and Deep Linking. The published artifact set on APIs.io includes API documentation, an API reference, an OpenAPI specification, and authentication docs.

Event-ingestion endpoints for sending installs, sessions and in-app events to AppsFlyer from a server or a non-mobile client. Covers the mobile S2S events API (api3), the legacy mobile S2S API (api2), the Web S2S API, the PC/Console/CTV S2S and client-app events APIs (both with dedicated sandbox hosts), the Engagements API for click and impression engagements, the deep-linking REST API, and the preload measurement S2S/C2S APIs.

## Machine-readable artifacts (25)

- **Documentation** — https://dev.appsflyer.com/hc/reference/api-reference-overview
- **APIReference** — https://dev.appsflyer.com/hc/reference
- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/appsflyer/refs/heads/main/openapi/appsflyer-server-to-server-events-api-for-mobile-openapi.yml
- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/appsflyer/refs/heads/main/openapi/appsflyer-legacy-server-to-server-events-api-for-mobile-openapi.yml
- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/appsflyer/refs/heads/main/openapi/appsflyer-web-server-to-server-api-openapi.yml
- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/appsflyer/refs/heads/main/openapi/appsflyer-pcconsolectv-events-api-openapi.yml
- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/appsflyer/refs/heads/main/openapi/appsflyer-pcconsolectv-client-app-events-api-openapi.yml
- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/appsflyer/refs/heads/main/openapi/appsflyer-engagements-api-openapi.yml
- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/appsflyer/refs/heads/main/openapi/appsflyer-deep-linking-rest-api-openapi.yml
- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/appsflyer/refs/heads/main/openapi/appsflyer-preload-measurement-api-1-openapi.yml
- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/appsflyer/refs/heads/main/openapi/appsflyer-preload-c2s-measurement-api-openapi.yml
- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/appsflyer/refs/heads/main/openapi/appsflyer-gcd-api-for-sdk-attribution-testing-1-openapi.yml
- **Overlay** — https://raw.githubusercontent.com/api-evangelist/appsflyer/refs/heads/main/overlays/appsflyer-server-to-server-events-api-for-mobile-overlay.yaml
- **Overlay** — https://raw.githubusercontent.com/api-evangelist/appsflyer/refs/heads/main/overlays/appsflyer-legacy-server-to-server-events-api-for-mobile-overlay.yaml
- **Overlay** — https://raw.githubusercontent.com/api-evangelist/appsflyer/refs/heads/main/overlays/appsflyer-web-server-to-server-api-overlay.yaml
- **Overlay** — https://raw.githubusercontent.com/api-evangelist/appsflyer/refs/heads/main/overlays/appsflyer-pcconsolectv-events-api-overlay.yaml
- **Overlay** — https://raw.githubusercontent.com/api-evangelist/appsflyer/refs/heads/main/overlays/appsflyer-pcconsolectv-client-app-events-api-overlay.yaml
- **Overlay** — https://raw.githubusercontent.com/api-evangelist/appsflyer/refs/heads/main/overlays/appsflyer-engagements-api-overlay.yaml
- **Overlay** — https://raw.githubusercontent.com/api-evangelist/appsflyer/refs/heads/main/overlays/appsflyer-deep-linking-rest-api-overlay.yaml
- **Overlay** — https://raw.githubusercontent.com/api-evangelist/appsflyer/refs/heads/main/overlays/appsflyer-preload-measurement-api-1-overlay.yaml
- **Overlay** — https://raw.githubusercontent.com/api-evangelist/appsflyer/refs/heads/main/overlays/appsflyer-preload-c2s-measurement-api-overlay.yaml
- **Overlay** — https://raw.githubusercontent.com/api-evangelist/appsflyer/refs/heads/main/overlays/appsflyer-gcd-api-for-sdk-attribution-testing-1-overlay.yaml
- **Authentication** — https://raw.githubusercontent.com/api-evangelist/appsflyer/refs/heads/main/authentication/appsflyer-authentication.yml
- **Conventions** — https://raw.githubusercontent.com/api-evangelist/appsflyer/refs/heads/main/conventions/appsflyer-conventions.yml
- **Sandbox** — https://raw.githubusercontent.com/api-evangelist/appsflyer/refs/heads/main/sandbox/appsflyer-sandbox.yml

## Other AppsFlyer APIs (10)

- [Pull API (Reporting Data)](https://apis.io/apis/appsflyer/pull-api-reporting-data/)
- [Management APIs](https://apis.io/apis/appsflyer/management-apis/)
- [Audience APIs](https://apis.io/apis/appsflyer/audience-apis/)
- [OneLink API](https://apis.io/apis/appsflyer/onelink-api/)
- [SKAdNetwork (SKAN) APIs](https://apis.io/apis/appsflyer/skadnetwork-skan-apis/)
- [OpenDSR API](https://apis.io/apis/appsflyer/opendsr-api/)
- [Click Signing API (Protect360)](https://apis.io/apis/appsflyer/click-signing-api-protect360/)
- [ROI360 Net Revenue API](https://apis.io/apis/appsflyer/roi360-net-revenue-api/)
- [Creative External API](https://apis.io/apis/appsflyer/creative-external-api/)
- [AppsFlyer MCP Server](https://apis.io/apis/appsflyer/appsflyer-mcp-server/)

## Tags

Event, Server-to-Server, Ingestion, Engagement, Deep Linking, CTV, preload

---

Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/appsflyer/events-apis-server-to-server-client-to-server/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/appsflyer/.