How are you measuring the incremental impact of Klaviyo email when paid ads, social, and organic are all running?

Since improving our popup form, our signup rate has increased from roughly 1% to 8%, which is great. We’re also seeing a noticeable uplift in Klaviyo-attributed revenue.

However, I’m trying to explain this accurately internally. Our Klaviyo uses an attribution window of 5 days, but for flows it's set for 2 hours, and credits the last eligible email interaction before a purchase, so I understand that attributed revenue is not necessarily the same as revenue caused exclusively by email. Customers may also have seen paid ads, social content, or organic search before purchasing.

For those running multiple acquisition channels, how do you separate:

• revenue directly driven by email;

• revenue where email likely assisted the conversion; and

• revenue that would probably have happened anyway through ads, social, or organic?

Is there a Klaviyo report or workflow you use to trace an individual conversion clearly—for example, “this email was sent on this date, this customer then placed this Shopify order on this date”? I know this would still be attribution rather than proof of causation, but I’d like an easy way to validate individual orders.

What setup and reporting do you find most useful? And how much do you (if you use it) trust using Claude to report correctly?