register attribution sources and triggers for event-level reports via the privacy sandbox attribution reporting api
domain: privacysandbox.google.com · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Register an attribution source (ad click or view) by having the browser process an Attribution-Reporting-Register-Source response header from your ad-serving endpoint.
Register a trigger (conversion) via an Attribution-Reporting-Register-Trigger header from your conversion endpoint, including event_trigger_data to match back to a source.
Stand up a reporting endpoint at the well-known path /.well-known/attribution-reporting/report-event-attribution to receive event-level reports.
Configure the optional event report window duration to control how long after source registration a trigger can still generate an event report.
Distinguish event-level reports (coarse, noised, privacy-limited) from aggregatable reports if more detailed conversion-value data is needed.
Known gotchas
If a trigger arrives after the event report window has passed but before the source's overall expiry, it can still match the source for attribution but will not generate an event report - a common cause of 'missing' conversions.
Event-level reports intentionally add noise and cap conversion data per report to preserve privacy - don't expect exact conversion counts or values.
Source/trigger registration requires the exact expected response headers on the exact well-known reporting path; a mismatch causes registration to silently no-op instead of erroring.
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