The article examines the integration of business processes in financial lease, a strategically significant direction for the industry’s development. Research interest in this area is driven by the need to enhance operational efficiency, improve transaction transparency, and reduce transaction costs. The current trends of digitalization, increasing competition, and regulatory changes compel leasing companies to comprehensively reconsider their internal and external interaction frameworks. However, a number of contradictions can be observed in the academic literature: some authors focus on integration primarily from the perspective of automation and IT solutions, while others emphasize structural transformations of the market and adaptation to the competitive environment. At the same time, certain aspects remain underexplored, including systemic digital transformation, the application of artificial intelligence and blockchain developments in leasing operations management, and the integration of processes into international financial ecosystems. The objective of this study is to systematize modern methods and integration strategies in financial lease and to identify the most effective approaches that contribute to cost reduction, improved customer experience, and increased resilience of business entities to market fluctuations. The analysis highlights the key integration vectors: automation of internal processes through ERP and CRM systems, the use of API interfaces for interaction with banks and government institutions, the development of digital platforms, and the implementation of artificial intelligence and big data technologies for risk assessment. The author’s contribution lies in consolidating fragmented integration concepts. The study will be useful for researchers exploring the digital transformation of financial services, representatives of leasing organizations, and IT solution developers focused on automating business processes.