[gt565k]

Depending on where your customer base is, the fraudulent transactions usually come from like the middle east, eastern europe, and other countries. See if you can track where those transactions are originating from HTTP request wise.

You might be able to just block traffic from those regions if it does not impact your business and customer base.

Not the best or cleanest solution, but when Stripe fails to handle fraud for you, you've got to get creative and hit the problem from all angles.