Device fingerprinting is a technique used to identify devices online by gathering detailed information about their characteristics, such as screen resolution, operating system, and hardware capabilities. This method is particularly useful in fraud detection, as it enables the creation of a unique identifier for each device that remains consistent even if app data is erased. The integration of device fingerprinting into a Kotlin-based Android application is facilitated through the Fingerprint Pro Android SDK, which generates a unique visitor identifier via hashing. The process involves setting up a backend to store and validate this identifier, ensuring that it was genuinely generated by Fingerprint and providing additional metadata like a confidence score. This approach addresses the limitations of traditional user identification methods, which are becoming obsolete due to evolving privacy restrictions, by collecting accessible data and creating a persistent unique identifier for each user. Fingerprinting enhances security by detecting unrecognized devices and can improve user experience by maintaining personalized settings without requiring repeated logins.