PurposeThe digitalization of an organization implies centralizing the data collected. Nevertheless, the management of customer data in franchise networks is a delicate, complicated and little studied issue. The purpose of this paper is to investigate its challenges and the keys to success, by developing a conceptual framework resulting from a qualitative study and a literature review.Design/methodology/approachA qualitative study was carried out with around 30 franchisors, franchisees and franchise experts in the light of the General Data Protection Regulation (GDPR). The results of the qualitative study helped to clarify our theoretical framework and to position ourselves on the side of the founding theories of relationship marketing. A research model was then defined and tested using a quantitative survey administered to a total sample of 192 franchisors and franchisees.FindingsThe results of the various studies show that relationship quality, through inter-organizational commitment, explains the achievement of marketing performance in franchise networks. In addition, the place of relationship quality depends on four essential variables: inter-organizational communication, franchisee autonomy, technical and human resources and contractualization of customer data management.Originality/valueThis study focuses on a topic that has received very little attention, particularly in franchise networks. It uses a mixed-methods design that has enabled the identification of key variables contributing to the achievement of marketing and sales performance in a data management context.