The trade that drove 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 cargo from the Baltic region. This trade laid the foundation for the prosperity achieved by groups of traders 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 during changing international economic cycles, 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 arise around important trade routes. Early modern cashless payments, including bills of exchange, "Cashless Payment", are assumed to create expanded trade opportunities and ensure a credible financial, credit and trade system. Examples of key questions that are asked are: How did trade develop for Gothenburg during the period? What competitive advantages did it have compared to 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 and which is then compared with other databases and with economic and legal material.