Why Retail Media Attribution Must Account for Omnichannel Behaviour

A neat attribution path is rarely how people shop

Retail media reporting often wants a simple line: the shopper saw an ad, then bought the product. Physical retail complicates that. A shopper may see an in-store message, scan a code, compare products, buy later online or purchase through another retailer channel. If attribution ignores that behaviour, it undervalues the store.

Closed-loop reporting is useful but incomplete

Closed-loop sales data is powerful when the exposure and transaction can be connected. But in-store media often influences decisions before the final purchase path is known. Engagement attribution helps fill the gap by showing what shoppers did in the middle of the journey.

The missing evidence is intent

An interaction is not the same as a sale, but it is evidence of intent. A product view, quiz response, comparison selection or PDP click can show that the media created active consideration. For brands selling complex products, this middle-funnel evidence is often what explains later conversion.

Retailers need a broader value story

If retailers sell in-store media only on sales uplift, they may underprice touchpoints that influence online, app or delayed purchases. Omnichannel attribution gives retailers a better proposition: media value is not just exposure in a store, but measurable movement through a connected journey.

How to improve attribution

Combine store, campaign and product-level engagement data with retailer sales where possible. Use controlled tests, timing comparisons and content engagement signals. The goal is not perfect individual tracking; it is a better understanding of influence across channels.