If anybody wants a little more code with their blog post, here is another example <a href="http:&#x2F;&#x2F;maxdemarzi.com&#x2F;2014&#x2F;02&#x2F;12&#x2F;online-payment-risk-management-with-neo4j&#x2F;" rel="nofollow">http:&#x2F;&#x2F;maxdemarzi.com&#x2F;2014&#x2F;02&#x2F;12&#x2F;online-payment-risk-managem...</a><p>A proper fraud detection system has lots of pieces. The one the customer was having trouble with was Cross Reference in real time.  Imagine 10k requests per second coming in, you can use cross reference to flag transactions for further analysis or as a partial weight to more fraud detection algorithms.