Most store visitors browse anonymously until they log in or enter an email at checkout. Without identity resolution, each anonymous session looks like a different person — your attribution fragments, retargeting audiences shrink, and conversion APIs receive events with weak match signals. Identity resolution stitches anonymous sessions to known customers. A visitor browses your store, adds to cart, leaves — then returns and completes checkout with their email. Upstack ID links that checkout identity to all prior anonymous events in the session and across devices. Suddenly Meta, TikTok, and Klaviyo can match conversions to the right profiles. Why it matters for ad platforms: higher match rates mean better optimization, larger retargeting pools, and more accurate ROAS. Upstack ID typically increases identified sessions by 30–60% compared to cookie-only tracking.Documentation Index
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How to set this up
Identity Resolution
How Upstack ID connects anonymous sessions to known customers.
Identity Resolution (Data Dictionary)
Fields and semantics for resolved identity.
Identity Stitching
How events are retroactively attributed within sessions.