Send app events to AppsFlyer via the Server-to-Server (S2S) Events API v3
domain: dev.appsflyer.com · 6 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
In AppsFlyer Security Center, generate a dedicated S2S token — not the legacy per-app dev_key.
POST to https://api3.appsflyer.com/inappevent/{app_id} with the S2S token as the auth header.
Include appsflyer_id and eventName as required fields, plus eventValue as a JSON object.
Include at least one device identifier — advertising_id/oaid/amazon_aid/imei for Android, or idfa/idfv for iOS.
For iOS, prefix app_id with 'id' matching the App Store numeric ID convention; omitting it returns a silent 200 OK with no event recorded.
Keep the JSON payload under the 1KB size cap per event.
Known gotchas
The legacy api2.appsflyer.com endpoint, authenticated with a plain dev_key, was deprecated starting December 2023 — don't build against reference pages that still document it.
Migrating from the old v2 endpoint to v3 is treated as one-way by most MMP integration partners; plan the cutover rather than toggling back and forth.
Payloads are capped at 1KB, noticeably smaller than comparable MMP S2S limits, so verbose eventValue objects can get silently rejected.
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