Browser Pixel + CAPI Deduplication

RapidMetrics fires Facebook events via two channels: the browser pixel (client-side) and CAPI (server-side). Facebook deduplicates them using a shared Event ID.

Why Both Channels?

• Browser pixel captures real-time signals (click ID, browser info) for ad targeting
• CAPI reaches Facebook even when the browser pixel is blocked by ad blockers or iOS privacy rules
• Together they give Facebook a higher-quality optimization signal

How Deduplication Works

Every event gets a unique event_id. Both channels send it - Facebook sees both but only counts one. You can verify deduplication in Facebook Events Manager where events will show a "Deduplication" flag.