Thanks! It varies depending on the model, but in most cases, yes, the confirmation of fraudulent activity is manual since having the ground truth be correct is critical
OK good to know. :) Would you be writing another blog post on what features you use for fraudulent activity, or do you consider this a business secret?
No, features are definitely a business secret. My goal was to share as much as possible that might be helpful to others combating fraud, without giving anything away that would hinder the effectiveness of our systems.