[nowarninglabel]

We exclusively use PayPal as they kindly cover all of our transaction fees. However, we still experience fraud which creates work for accounting and Customer Service.

A rules-based approach has helped, but we've also been playing around with SiftScience[1] and I've seen it do wonders for some sites, so we'll likely be implementing it. The key problem is keeping the false positive rate down, as we don't want to inadvertently block our legitimate users.

[1] https://siftscience.com/