Deposits and down payments
Deposits hold a vehicle, and down payments can be large. Put deposit terms in writing. Many dealers set their own limit on card down payments because of cost; that is your policy, and it should be applied consistently.
Service and parts
Service departments see steady card volume. Integrated dealer software and text-to-pay reduce keyed transactions.
Multiple departments
Sales, service, parts and body shop often run separate accounts. Consolidating fees or negotiating them together avoids paying junk fees several times.
High-value fraud
Big-ticket card payments attract fraud. Verify ID and use address verification on remote payments.