Trust Sift for user identification across multiple accounts and devices

It is primarily being used for fraud detection in our JobSpotter department. This is an app where users can perform a service with an incentive of amazon gift cards. However, there is a benefit given to first submissions, so there is a problem with users creating multiple accounts to try to game the system unfairly. We highly rely on Sift Digital Trust & Safety Suite's ability to identify multiple accounts created by a single "user" to dismiss submissions by duplicate accounts.