If your VDP URLs are like this: VehicleDetails/used-2020-Chevrolet-Silverado_1500-Crew_Cab_Short_Box_4_Wheel_Drive_LTZ-KIRKSVILLE-MO/5138833700 then you probably need your website vendor to provide a feed of vehicles with their URL, because they aren't VIN or stock number based.
If your website vendor can do that, I can probably find a solution for you.
If your website provider can't, there are website scraping options that will copy every VDP and save it to a list, but that's much less reliable in the long run.