Exploring Opportunities for Supermarket Cashback Sites within AdTech and Retail Media Networks

I'm seeking insights on how a supermarket cashback site might find its place in the adtech space, specifically in relation to Retail Media Networks (RMNs). My background is extensive in adtech, but I'm relatively fresh to RMNs. Measurement is a distinct advantage here, as it extends beyond a single supermarket chain, although scale can be a limiting factor. The user base is moderate, around 1-2 million users monthly, and the company itself is small but growing, with under 30 employees. They have a robust dataset on product purchases from various supermarkets, which could be an edge over standalone RMNs. The goal is to build partnerships across a wide range of stakeholders – from clients and agencies to adtech trading platforms, data and insight companies, and even fintech firms. While the capacity to create numerous direct advertiser relationships is limited, there might be other media strategies to consider. Engaging with a reseller or leveraging someone's media buying capabilities could be a path forward. Recently, the focus has been on providing custom Facebook creative solutions to drive users to their proprietary platform using Facebook tracking links due to higher click rates. I'm curious about how RMNs integrate with the open web. There seems to be potential in becoming a solution provider for measurement companies like Ipsos, Kantar, IRI, Nielsen, and Experian, possibly by acting as a seed panel partner. Any advice or direction to explore further would be highly appreciated.