If you are not mind switching the fraud prevention vendor, you may consider FraudLabs Pro (https://www.fraudlabspro.com/supported-platforms/whmcs), and you can create a validation rule to validate only for certain payment gateway.
We have a special offer to WHMCS community. If you have integrated FraudLabs Pro API into your projects, please show us your fabulous works by email us at sales@fraudlabspro.com. You are entitled to a free upgrade to Small Plan for a year (worth $1999.40) . Limited time offers for the first 50 users. Terms and conditions applied. Please mention #WHMCSFREE# in email.