The trade that drove the development and transformed Gothenburg's role as a gateway and enabled greater financial integration was the extensive export of herring from Gothenburg with grain in return loads from the Baltic region. This trade laid the foundation for the prosperity achieved among groups of merchants in the early 19th century. The aim of the project is to analyze the European payment and credit system in the early modern period, based on the flow of goods under changing international economic conditions, and to map the actors involved in trade and credit networks. The significance for the research situation is that it will be possible to systematize the path of goods flows through the gateway systems that emerge around important trade routes. Early modern cashless payments, through e.g. bills of exchange, "Cashless Payment" are assumed to create extended trade opportunities and ensure a credible financial, credit and trade system. Examples of central questions that are asked are: How did trade develop for Gothenburg during the period? What competitive advantages did it have compared with other cities in Europe? What role did Swedish trading cities play in a larger system of European gateways? The project is carried out by systematically mapping the foreign ship traffic to and from Gothenburg, through a continued expansion of the database of Gothenburg's two-day journals that I work with, which is then compared with other databases and with economic and legal material.