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Abandoned cart flows only fire when Klaviyo knows who the abandoner is. Shopify’s native integration identifies visitors who log in or enter their email at checkout — but many abandoners browse anonymously, add to cart, and leave without ever identifying themselves. Those carts are invisible to Klaviyo. Upstack fixes this with identity resolution. When a visitor adds to cart or initiates checkout, Upstack ID resolves them — using cookies, click IDs, and cross-session behavior — and sends enriched AddToCart and InitiateCheckout events to Klaviyo with the customer’s email attached. Klaviyo can now trigger the abandoned cart flow even when Shopify’s native integration would have missed the visitor.
Stores using Upstack Flows with Klaviyo typically see a 20–40% increase in abandoned cart flows triggered compared to Klaviyo’s native Shopify integration alone.

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How to set this up

Connect Klaviyo

Configure the Klaviyo destination and flow triggers.

Identity Resolution

How Upstack ID identifies anonymous abandoners.

Connect a Destination

Add and configure destinations in the dashboard.

Complete Klaviyo Abandonment Flows Guide

Boost Klaviyo Abandonment Revenue

Resolve Visitor Identities

Improve Meta Match Quality