Carfax Service For Private Transaction

I am working with a private ownership on a car purchase transaction. They have proposed a transaction where I provide my contact information and payment to Carfax. Once I receive delivery of the vehicle and approve after my inspection, Carfax remits payment to them within 5 days. I'm contacting you to confirm this payment. If not, I suspect this is a scam using your company as a vehicl (pun intended) and notifying you as such. My last correspondence to them asked for the VIN and Carfax contact information. N