Those who are in charge of the complex task of modernizing the architecture and functionality of the ATM network are faced with an increasingly complex decision-making environment and, without the right vision, many of these processes fail or result in a network with an architecture that is more difficult to understand, more costly to operate, with more dependencies on third parties and with a high degree of slowness in adding or modifying transactions. Through this article, we will address the challenges of modernization and the recommendations for doing so adequately.