In order to eleminate in the open digital advertising ecosystem :
Identify all intermediaries that participate in the flow of money from the buying platform back to the publisher.
Publisher : There is no need to supply a SupplyChain object via tags that are not sent on behalf of intermediaries.
Intermediary : Sellers.json and SupplyChain are specifications to be implemented by or consumed by advertising systems: DSPs, SSPs/exchanges and ad servers. Therefore a sellers.json file is mandatory.
3 mandatory elements:
Typo is not respected : seller_id is a number and not a string (required):