Rewe Opens Its In-Store Checkout Data to Advertisers Via The Trade Desk
TL;DR: Rewe is integrating in-store checkout (POS) purchase data into its Trade Desk retail-media offer, letting advertisers build purchase-based audiences from real store transactions rather than online data alone.
Offline Data Goes Programmatic
Rewe is expanding its retail-media partnership with The Trade Desk so that bricks-and-mortar checkout data now feeds its offer, as reported on 17 September 2026. Previously the partnership drew on online shopping data only; in-store purchase data is the new addition.
It enables advertisers to build purchase-based target audiences from real store transactions — a meaningful upgrade in a grocery market that is still overwhelmingly physical.
Why This Is a Milestone
Bridging offline purchase data into programmatic targeting is a major step for German retail media. Most grocery spending happens in-store, so online-only data always captured a fraction of the real signal. Closing that gap makes the audiences far more representative.
It deepens grocers' rivalry with Amazon and pure-play platforms for advertising budgets, using the one asset the platforms lack: physical purchase behaviour at scale.
The Data Advantage
First-party purchase data is retail media's core currency, and in-store transactions are the richest, hardest-to-replicate version of it. Rewe is effectively monetising a dataset it already owned but couldn't fully activate.
For advertisers, the appeal is targeting people by what they actually buy, not just what they browse — closer to the moment of truth.
Marketing Minute's Take
This is the direction of travel for all grocery retail media: turn the checkout into an ad-targeting asset. For brands, richer in-store data means less wasted spend, but also new questions on consent and measurement. Ask Rewe how the data is permissioned and how closed-loop the measurement really is before you assume the audiences are as good as they sound.
Quick FAQ
What did Rewe change in its retail-media offer?
It integrated in-store checkout (POS) purchase data into its Trade Desk partnership, which previously used online shopping data only, letting advertisers target audiences based on real store transactions.
Why is in-store data important for retail media?
Most grocery spending happens in physical stores, so adding checkout data makes audiences far more representative and deepens grocers' rivalry with Amazon and pure-play platforms.
What should advertisers check?
How the in-store data is permissioned for advertising use and how closed-loop the measurement is, before assuming the audiences perform as well as they sound.
Turning the checkout into an ad-targeting asset is the direction of travel for all grocery retail media, and Rewe is monetising data it already owned. For brands it means less wasted spend — but also fresh questions on consent and measurement. Before you buy, ask how the data is permissioned and how closed-loop the measurement truly is. — Daniel Nikolla, Founder of Merx Marketing
The takeaway: grocers are turning checkout data into programmatic targeting — richer audiences, but interrogate consent and closed-loop measurement before you buy.
For your retail-media buys, do you know how the purchase data is permissioned and measured?
If you would like to know more about this topic, please contact us on danieln@merxmarketing.co.uk
Sources: Meedia, Lebensmittelpraxis.
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Written by Daniel Nikolla, Founder of Merx Marketing Ltd and Marketing Minute
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