How does a preapproved car loan work?

I’m about to get a new car just dont know what yet. Want to get the loan today because Friday Im going to go look. Want the money with me so I can buy it on the spot.I know for a regular car loan they ask for a VIN number.If I get a preapproved loan and dont use all the money that is on the loan how would i use or return it?


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