Some of the most important scientific areas in the field of economics are those concerning international relations and tourism. The economies reach their highest level of maturity the more open they are to the outside, both from the point of view of real flows (goods, services and people), and financial flows (payment methods and reserves). Research in areas such as international trade, tourism, trade policy, financial integration, the company's international marketing, international strategy, international transport and logistics, payment methods and international financing, among other more specific lines on integration processes that refer to the European Union, is a broad research area of particular relevance in the context of European integration that has not been thoroughly addressed in university studies, which is what this doctoral programme intends.