A primer on machine learning for fraud detection

For example, the number of countries in which a card was used (across all the businesses working with Stripe) in the recent past is a very precise indicator of fraud.

.. When a business using Stripe sees a card for the first time, there’s an 80% chance that we’ve seen the card elsewhere on the Stripe network in the past. Previous encounters with a card offer a significant amount of data to inform our risk assessments.