I use the MinFraud service from MaxMind to try to avoid unauthorized transactions. Using Braintree, I first do an Authorization, if that goes through, I send details to MinFraud. If that passes a threshold, then I submit the payment for settlement. If not, I void the transaction.
This process has helped to avoid all kinds of scammers using my website to try to validate stolen credit card details.
This process has helped to avoid all kinds of scammers using my website to try to validate stolen credit card details.