Signifyd

Lots of great data points for making a decision whether to accept or deny, and if you aren't sure submit it for insurance for a reasonable percentage of the order. I have used Cybersource's Decision Manager and Kount in the past before our site was on Shopify. Both were a pain to integrate and had user interface's that look straight out of the early 2000s when they were created.

Signifyd has a nice user interface and integration with shopify is as simple as pushing a button.