Send server-to-server (S2S) events to Branch's Events API with the correct attribution identifiers
domain: help.branch.io · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
POST standard events to the v2/event/standard endpoint (or custom events to v2/event/custom) with Content-Type application/json
Include the branch_key in the request body along with the event name and any content items describing the associated Branch Universal Object
Supply the required S2S attribution identifiers: developer_identity or browser_fingerprint_id universally, plus os/os_version and idfa or idfv on iOS, or aaid/android_id on Android
For Facebook Aggregated Event Measurement campaigns, also include the anon_id parameter (and os_version for iOS Facebook campaigns specifically)
Confirm events are being attributed correctly by cross-checking them against the originating install/click in Branch's dashboard
Known gotchas
Missing the platform-specific identifiers (idfa/idfv on iOS, aaid/android_id on Android) breaks attribution even if the event itself is accepted
Overriding the source IP via a header requires also setting the matching IP in the request body and getting the app allowlisted by Branch support first — the header alone is not sufficient
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