Perfect White Tee Adds $92K in Monthly Abandonment Flow Revenue Using Upstack's Identity Resolution for Klaviyo

Missed Flow Revenue from “Invisible” Customers

Perfect White Tee had a strong Klaviyo setup. Their team understood their audience, designed excellent flows, and had a high-performing campaign engine.

And yet, revenue was being left on the table.

After scaling to 8-figures in revenue, the team noticed inconsistencies in their flow performance—especially in abandoned cart sequences. Emails weren’t firing when they should have.

The brand was also working with a third-party enrichment tool that added external emails to their Klaviyo account. While this initially increased volume, it came with a cost:

• Declining deliverability scores
• Higher spam and unsubscribe rates
• Cannibalized existing Klaviyo flows

Worse yet, returning customers weren’t being recognized if they returned on a different device, browser, or session. These were known customers… but they were being treated like strangers.

Precision Identity Matching + Flow-Level Cleanup

Perfect White Tee partnered with Upstack to fix the core issue and identity resolution across sessions, browsers, and devices.

After a white-glove onboarding, Upstack ran a full audit of their Klaviyo setup. The team deployed Upstack’s abandonment flow enrichment engine and ran a head-to-head comparison between:

• Upstack-identified users
• Third-party enrichment tool

The results were clear:

• The third-party tool mostly overlapped or cannibalized standard flows
• Upstack’s flows triggered exclusively for visitors who otherwise would have been missed

Upstack’s solution included:

• Real-time identity matching of returning visitors
• Cross-device/session enrichment of known users
• Flow configuration to exclude all users who already received standard Klaviyo automation
• Coordination with Perfect White Tee’s email agency to resolve deliverability issues

Implementation took less than 30 minutes.

No disruption to existing flows. No dev time. Just better targeting.

+$92K/Month in Additional Flow Revenue

Within 30 days:

• Upstack-enriched flows added $92,000/month on top of existing Klaviyo performance
• Standard Klaviyo flows continued performing at $115,000/month
• Deliverability improved across the board after removing third-party sourced emails
• Flow volume increased by 1.8x, driven by more accurate session-level identity

Importantly, Upstack didn’t touch creative or send duplicate emails. Instead, it enriched the existing system by triggering flows only for users who were previously missed.

"These were emails that would’ve never been sent without Upstack. That’s not optimization.  it’s recovered revenue."

Why It Worked

Klaviyo’s automation depends on identifying the customer in-session.

But if a returning visitor opens a new browser, clears cookies, or switches devices then Klaviyo can’t connect them to their profile.

Upstack fixed that gap.

By tracking users persistently across devices and sessions, Upstack made sure every known customer was properly identified, and every triggered flow had the right data behind it.

This enabled:

• Higher abandonment flow volume
• Improved targeting logic
• No cannibalization of existing automations

And because Upstack sent only enriched events, Perfect White Tee’s deliverability recovered, leading to long-term performance gains.