A new factoring company has no loss history, no habits and no backlog of trusted clients. That's the best time to decide how you'll verify carriers, because controls are easier to start with than to retrofit after a bad payment.
CarrierKYC helps in two ways: free tools and guides for the basics, and Verified Payee, which checks that each applicant controls the carrier and owns the bank account, and re-verifies every payee change before the next ACH.