When I test drive the car I want to pay for it and take the car. How does this work?
depends on the seller, most want your driver's license then you are stopped without your driver's license~
if you are serious, will take it for a 26 point inspection to find that the thing was NEVER maintained, possibly welded together with two wrecks, a lot can be gained from looking at the wear items and lazer wheel alignment~
Pay cash and transfer the title at the DMV or auto notary depend on what state you live in.
If it's from a private seller, follow this link: https://cargurus.helpscoutdocs.com/article/247-a-buyer-wants-to-test-drive-my-car-what-do-i-do