Transpromo involves integrating marketing or advertising messages into administrative documents sent to customers, such as account statements or invoices. This practice offers a dual advantage. First, it allows companies to leverage a medium already funded to meet a legal or service obligation. Second, it takes advantage of a medium the recipient typically consults. With transpromo, marketing or advertising messages can be personalized based on information held about the recipient and data contained within the administrative document. This process can be initiated by the document sender or used as advertising space by a third party. Transpromo is a key element of direct marketing. Its evolution is impacted by the increasing digitization of invoices and statements.