Sift Science (<a href="http:&#x2F;&#x2F;siftscience.com" rel="nofollow">http:&#x2F;&#x2F;siftscience.com</a>) CEO here. We focus on helping online businesses like Airbnb, Match.com, and OpenTable automate away their fraud problems with realtime machine learning. Many of our customers use us an additional layer of protection in addition to what Stripe or any other payment gateway offers. I&#x27;m happy to answer any questions about fraud.