E-commerce companies face significant financial losses due to online fraud, which can be mitigated by accurately identifying website visitors. Traditional methods such as cookies and IP addresses are inadequate due to the increasing use of incognito modes and VPNs. The Fingerprint device intelligence platform offers a solution by providing a highly accurate visitor identifier through browser fingerprinting, which gathers detailed browser configuration data to uniquely identify users. This tool helps prevent various types of fraud, such as account takeovers and chargebacks, while enhancing personalization and user experience. The integration, available as an open-source VCL template, can be added to Fastly CDN services to achieve maximum identification accuracy despite challenges posed by ad blockers and privacy-focused browsers. Fingerprint Pro extends these capabilities with advanced server-side signals and machine-learning algorithms for enhanced identification, even offering solutions for mobile devices. The Fastly VCL Proxy Integration facilitates the seamless incorporation of Fingerprint's services, maintaining compliance and auditing standards by eliminating the use of cookies. Through these integrations, e-commerce sites can effectively combat fraud while optimizing user interactions.